Analysis
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max time kernel
138s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
20-04-2024 02:07
Behavioral task
behavioral1
Sample
ya.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
ya.exe
Resource
win10v2004-20240412-en
General
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Target
ya.exe
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Size
63KB
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MD5
222c2d239f4c8a1d73c736c9cc712807
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SHA1
c3aa61bd6f8cc640bcfa74c40d9283c9c08c7b3c
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SHA256
ff43049677c57277f12a1d97f02af3029d7b75b5ad40303a28f1b0452997969d
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SHA512
1f2fea85e45e93916306c234b916d6b4b200dac9656e44f4555f825dd8677cb5e927bd5e7a74bf2fb2f6972a3e6e2d294a6104add162ba3d53a0e6cfedef6a02
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SSDEEP
1536:tJc/5q1qoR5PDdAZcIED4VuCkbFybjQ9f0jQRmONww+W:7c/iqoJekbFEQ9W+mONP+W
Malware Config
Extracted
xworm
127.0.0.1:23638
209.25.140.1:5525:23638
bring-recorder.gl.at.ply.gg:23638
action-yesterday.gl.at.ply.gg:23638
147.185.221.19:23638
then-wheel.gl.at.ply.gg::23638
then-wheel.gl.at.ply.gg:23638
teen-modes.gl.at.ply.gg:23638
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Install_directory
%LocalAppData%
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install_file
uwumonster.exe
Signatures
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Detect Xworm Payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/1796-0-0x0000000000950000-0x0000000000966000-memory.dmp family_xworm C:\Users\Admin\AppData\Local\uwumonster.exe family_xworm -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
ya.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000\Control Panel\International\Geo\Nation ya.exe -
Drops startup file 2 IoCs
Processes:
ya.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\uwumonster.lnk ya.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\uwumonster.lnk ya.exe -
Executes dropped EXE 3 IoCs
Processes:
uwumonster.exehklnqi.exeuwumonster.exepid process 4272 uwumonster.exe 2220 hklnqi.exe 3900 uwumonster.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
ya.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\uwumonster = "C:\\Users\\Admin\\AppData\\Local\\uwumonster.exe" ya.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious use of AdjustPrivilegeToken 6 IoCs
Processes:
ya.exeuwumonster.exeAUDIODG.EXEuwumonster.exedescription pid process Token: SeDebugPrivilege 1796 ya.exe Token: SeDebugPrivilege 1796 ya.exe Token: SeDebugPrivilege 4272 uwumonster.exe Token: 33 4480 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 4480 AUDIODG.EXE Token: SeDebugPrivilege 3900 uwumonster.exe -
Suspicious use of WriteProcessMemory 5 IoCs
Processes:
ya.exedescription pid process target process PID 1796 wrote to memory of 3592 1796 ya.exe schtasks.exe PID 1796 wrote to memory of 3592 1796 ya.exe schtasks.exe PID 1796 wrote to memory of 2220 1796 ya.exe hklnqi.exe PID 1796 wrote to memory of 2220 1796 ya.exe hklnqi.exe PID 1796 wrote to memory of 2220 1796 ya.exe hklnqi.exe -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\ya.exe"C:\Users\Admin\AppData\Local\Temp\ya.exe"1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "uwumonster" /tr "C:\Users\Admin\AppData\Local\uwumonster.exe"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\hklnqi.exe"C:\Users\Admin\AppData\Local\Temp\hklnqi.exe"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\uwumonster.exeC:\Users\Admin\AppData\Local\uwumonster.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x504 0x2f81⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\uwumonster.exeC:\Users\Admin\AppData\Local\uwumonster.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\uwumonster.exe.logFilesize
654B
MD52ff39f6c7249774be85fd60a8f9a245e
SHA1684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA256e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
SHA5121d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1
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C:\Users\Admin\AppData\Local\Temp\hklnqi.exeFilesize
83KB
MD51453f56916c0ea96b9ba5b49f09757e2
SHA13e25edc13b69e5db4769f061f586e42b812996bf
SHA256da79e0317881f0600ddaddf593184b1e7d6eb54604de089e4d625741e21c004b
SHA51237febf9c7bd3f35b45de356e8dc92a9bd5e065471669cb9afdb7048308df0c852b3cbfc5f2a3cab2887d67c9dab4f2fb2bb21ee9de42d13b700784367d1f8ca6
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C:\Users\Admin\AppData\Local\uwumonster.exeFilesize
63KB
MD5222c2d239f4c8a1d73c736c9cc712807
SHA1c3aa61bd6f8cc640bcfa74c40d9283c9c08c7b3c
SHA256ff43049677c57277f12a1d97f02af3029d7b75b5ad40303a28f1b0452997969d
SHA5121f2fea85e45e93916306c234b916d6b4b200dac9656e44f4555f825dd8677cb5e927bd5e7a74bf2fb2f6972a3e6e2d294a6104add162ba3d53a0e6cfedef6a02
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memory/1796-7-0x000000001C950000-0x000000001C95C000-memory.dmpFilesize
48KB
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memory/1796-8-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmpFilesize
10.8MB
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memory/1796-9-0x000000001B520000-0x000000001B530000-memory.dmpFilesize
64KB
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memory/1796-0-0x0000000000950000-0x0000000000966000-memory.dmpFilesize
88KB
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memory/1796-6-0x000000001B520000-0x000000001B530000-memory.dmpFilesize
64KB
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memory/1796-1-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmpFilesize
10.8MB
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memory/3900-26-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmpFilesize
10.8MB
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memory/3900-27-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmpFilesize
10.8MB
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memory/4272-13-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmpFilesize
10.8MB
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memory/4272-15-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmpFilesize
10.8MB