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Trojan.Siggen13.55716
Added to the Dr.Web virus database:
2021-06-12
Virus description added:
2021-06-13
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[<HKCU>\Software\Classes\loomDesktop\shell\open\command] '' = '"%LOCALAPPDATA%\Programs\Loom\Loom.exe" "%1"'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'electron.app.Loom' = '%LOCALAPPDATA%\Programs\Loom\Loom.exe --process-start-args "--loomHidden"'
Malicious functions
Executes the following
'<SYSTEM32>\taskkill.exe' /F /Fi "IMAGENAME eq Loom Helper"
'<SYSTEM32>\taskkill.exe' /F /Fi "IMAGENAME eq Loom"
Injects code into
the following user processes:
Modifies file system
Creates the following files
Deletes the following files
%TEMP%\nsm61bf.tmp\app-64.7z
%TEMP%\nsm61bf.tmp\nsis7z.dll
%TEMP%\nsm61bf.tmp\nsprocess.dll
%TEMP%\nsm61bf.tmp\spiderbanner.dll
%TEMP%\nsm61bf.tmp\stdutils.dll
%TEMP%\nsm61bf.tmp\system.dll
%TEMP%\nsm61bf.tmp\winshell.dll
%APPDATA%\loom\preferences~rf13d799.tmp
%APPDATA%\loom\transportsecurity~rf13f630.tmp
%APPDATA%\loom\network persistent state~rf14b7ba.tmp
Moves the following files
from %APPDATA%\loom\storage\app-unexpected-quit.json.3146142721 to %APPDATA%\loom\storage\app-unexpected-quit.json
from %APPDATA%\loom\transportsecurity to %APPDATA%\loom\transportsecurity~rf13f630.tmp
from %APPDATA%\loom\08bb1b2d-b1db-420f-b56c-6d585f21f699.tmp to %APPDATA%\loom\transportsecurity
from %APPDATA%\loom\storage\current_video_device.json.3406262554 to %APPDATA%\loom\storage\current_video_device.json
from %APPDATA%\loom\storage\current_audio_device.json.1273956831 to %APPDATA%\loom\storage\current_audio_device.json
from %APPDATA%\loom\preferences to %APPDATA%\loom\preferences~rf13d799.tmp
from %APPDATA%\loom\0957f26f-2b53-404c-a0f1-421563ae4c6c.tmp to %APPDATA%\loom\network persistent state
from %APPDATA%\loom\b55ea5f5-b140-4bbb-ae53-5b4f5c1ef11f.tmp to %APPDATA%\loom\preferences
from %APPDATA%\loom\storage\last-recording-event.json.2061545704 to %APPDATA%\loom\storage\last-recording-event.json
from %APPDATA%\loom\storage\current_audio_device.json.1642451514 to %APPDATA%\loom\storage\current_audio_device.json
from %APPDATA%\loom\storage\current-recording-videoid.json.3727480439 to %APPDATA%\loom\storage\current-recording-videoid.json
from %APPDATA%\loom\code cache\wasm\index-dir\temp-index to %APPDATA%\loom\code cache\wasm\index-dir\the-real-index
from %APPDATA%\loom\code cache\js\index-dir\temp-index to %APPDATA%\loom\code cache\js\index-dir\the-real-index
from %APPDATA%\loom\local storage\leveldb\000001.dbtmp to %APPDATA%\loom\local storage\leveldb\current
from %APPDATA%\loom\storage\selected_video_devices.json.1344270839 to %APPDATA%\loom\storage\selected_video_devices.json
from %APPDATA%\loom\storage\selected_audio_devices.json.2186886982 to %APPDATA%\loom\storage\selected_audio_devices.json
from %APPDATA%\loom\storage\current_video_device.json.285255333 to %APPDATA%\loom\storage\current_video_device.json
from %APPDATA%\loom\storage\show_shortcut_reminder.json.2914100012 to %APPDATA%\loom\storage\show_shortcut_reminder.json
from %APPDATA%\loom\transportsecurity to %APPDATA%\loom\transportsecurity~rf14a9b6.tmp
from %APPDATA%\loom\network persistent state to %APPDATA%\loom\network persistent state~rf14b7ba.tmp
Substitutes the following files
%APPDATA%\loom\preferences
Network activity
Connects to
'ht#######ke.logs.datadoghq.com':443
'r4######5hne6nsz.gvt1.com':443
'oo#####-x1.puregig.net':8080
'sp#####st-ams.retn.net':8080
'sp######t3.serverius.net':8080
'sp######t.hyperfilter.com':8080
'sp#####d.phoenixnap.com':8080
'ap#.#egment.io':443
're####ctor.gvt1.com':443
'lo##.com':443
'sp###test.net':443
'sp###test.net':80
'o3#####.ingest.sentry.io':443
'ca####e.apple.com':443
'ic###azip.com':443
'cd#.#egment.com':443
'go#####analytics.com':443
TCP
HTTP GET requests
http://sp#######.hyperfilter.com:8080/speedtest/latency.txt via sp######t.hyperfilter.com
HTTP POST requests
http://sp#######.hyperfilter.com:8080/speedtest/upload.php via sp######t.hyperfilter.com
Other
'ht#######ke.logs.datadoghq.com':443
'ic###azip.com':443
'ca####e.apple.com':443
'o3#####.ingest.sentry.io':443
'sp###test.net':443
'lo##.com':443
'cd#.#oom.com':443
're####ctor.gvt1.com':443
'cd#.#egment.com':443
'r4######5hne6nsz.gvt1.com':443
'go#####analytics.com':443
'ap#.#egment.io':443
UDP
DNS ASK ht#######ke.logs.datadoghq.com
DNS ASK r4######5hne6nsz.gvt1.com
DNS ASK oo#####-x1.puregig.net
DNS ASK sp#####st-ams.retn.net
DNS ASK sp######t3.serverius.net
DNS ASK sp#####d.phoenixnap.com
DNS ASK sp######t.hyperfilter.com
DNS ASK cd#.#oom.com
DNS ASK lo##.com
DNS ASK cd#.#egment.com
DNS ASK re####ctor.gvt1.com
DNS ASK sp###test.net
DNS ASK o3#####.ingest.sentry.io
DNS ASK ca####e.apple.com
DNS ASK ic###azip.com
DNS ASK my##.#pendns.com
DNS ASK ap#.#egment.io
DNS ASK go#####analytics.com
Miscellaneous
Searches for the following windows
ClassName: '#32770' WindowName: ''
ClassName: 'Chrome_MessageWindow' WindowName: '%APPDATA%\Loom'
ClassName: '' WindowName: ''
Creates and executes the following
'%LOCALAPPDATA%\programs\loom\loom.exe'
'%LOCALAPPDATA%\programs\loom\loom.exe' --type=gpu-process --field-trial-handle=952,12661963262623669262,7852825101916957714,131072 --enable-features=WebAssemblySimd,WebComponentsV0Enabled --disable-features=CookiesWithoutSameSiteMus...
'%LOCALAPPDATA%\programs\loom\loom.exe' --type=crashpad-handler --user-data-dir=%APPDATA%\Loom /prefetch:7 --no-rate-limit --monitor-self-annotation=ptype=crashpad-handler --database=%APPDATA%\Loom\Crashpad --url=https://o398470.inge...
'%LOCALAPPDATA%\programs\loom\resources\app.asar.unpacked\dist\binaries\loom-recorder-production.exe' "{\"type\":\"daemon-start\",\"payload\":{\"daemonOptions\":{\"secret\":\"edb5c4100b604c6ca4e8ef337fd3b69a\",\"pipePath\":\"\\\\.\\pipe\\loom_ipc_65037\"}}}"
'%LOCALAPPDATA%\programs\loom\loom.exe' --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=952,12661963262623669262,7852825101916957714,131072 --enable-features=WebAssemblySimd,WebComponentsV0Enabled ...
'%LOCALAPPDATA%\programs\loom\loom.exe' --type=renderer --autoplay-policy=no-user-gesture-required --field-trial-handle=952,12661963262623669262,7852825101916957714,131072 --enable-features=WebAssemblySimd,WebComponentsV0Enabled --di...
'%LOCALAPPDATA%\programs\loom\loom.exe' --type=utility --utility-sub-type=audio.mojom.AudioService --field-trial-handle=952,12661963262623669262,7852825101916957714,131072 --enable-features=WebAssemblySimd,WebComponentsV0Enabled --di...
'<SYSTEM32>\cmd.exe' /d /s /c "wmic path win32_VideoController get name"' (with hidden window)
'<SYSTEM32>\cmd.exe' /d /s /c "taskkill.exe /F /Fi "IMAGENAME eq Loom""' (with hidden window)
'<SYSTEM32>\cmd.exe' /d /s /c "taskkill.exe /F /Fi "IMAGENAME eq Loom Helper""' (with hidden window)
'%LOCALAPPDATA%\programs\loom\resources\app.asar.unpacked\dist\binaries\loom-recorder-production.exe' "{\"type\":\"daemon-start\",\"payload\":{\"daemonOptions\":{\"secret\":\"edb5c4100b604c6ca4e8ef337fd3b69a\",\"pipePath\":\"\\\\.\\pipe\\loom_ipc_65037\"}}}"' (with hidden window)
Executes the following
'<SYSTEM32>\cmd.exe' /d /s /c "wmic path win32_VideoController get name"
'<SYSTEM32>\wbem\wmic.exe' path win32_VideoController get name
'<SYSTEM32>\cmd.exe' /d /s /c "taskkill.exe /F /Fi "IMAGENAME eq Loom""
'<SYSTEM32>\cmd.exe' /d /s /c "taskkill.exe /F /Fi "IMAGENAME eq Loom Helper""
Curing recommendations
Windows
macOS
Linux
Android
If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space .
If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.
If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
Switch off your device and turn it on as normal.
Find out more about Dr.Web for Android
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