Analysis
- max time kernel
145s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20231222-en - resource tags
- submitted
13/01/2024, 03:08
General
- Target 9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe
- Size 819KB
- Sample240113-dm79mabfb9
- SHA256 9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5
Malware Config
Extracted
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djvu
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http://zexeq.com/test1/get.php
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extension
.cdqw
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offline_id
mMsRxMUuXypapZbGOAfxD9pczHmW8zVRP7Pgjwt1
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payload_url
http://brusuax.com/dl/build2.exe
http://zexeq.com/files/1/build3.exe
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ransomnote
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Signatures
- Detect Vidar Stealer 5 IoCs
- Detected Djvu ransomware 18 IoCs
- Djvu Ransomware
Ransomware which is a variant of the STOP family.
- Vidar
Vidar is an infostealer based on Arkei stealer.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 2 IoCs
- Modifies file permissions 1 TTPs 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of SetThreadContext 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of WriteProcessMemory 39 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe"C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe"C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\73c24623-08d3-496a-8608-cc58674c4fc8" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe"C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe"C:\Users\Admin\AppData\Local\Temp\9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\c96d8005-863f-4f3e-afe6-be6e6e321378\build2.exe"C:\Users\Admin\AppData\Local\c96d8005-863f-4f3e-afe6-be6e6e321378\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\c96d8005-863f-4f3e-afe6-be6e6e321378\build2.exe"C:\Users\Admin\AppData\Local\c96d8005-863f-4f3e-afe6-be6e6e321378\build2.exe"6⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4288 -s 19607⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4288 -ip 42881⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
9a880d7572486dd985ed6ffbf55eee8875077d9614befc12d5fbdaafd45e86d5.exe
build2.exe
build2.exe
memory/2024-44-0x0000000000540000-0x0000000000640000-memory.dmp
memory/2024-46-0x0000000002090000-0x00000000020DB000-memory.dmp
memory/3104-3-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3104-15-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3104-6-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3104-5-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3104-4-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3892-2-0x0000000002370000-0x000000000248B000-memory.dmp
memory/3892-1-0x0000000002230000-0x00000000022CF000-memory.dmp
memory/4144-18-0x0000000002120000-0x00000000021BF000-memory.dmp
memory/4288-45-0x0000000000400000-0x000000000065E000-memory.dmp
memory/4288-48-0x0000000000400000-0x000000000065E000-memory.dmp
memory/4288-41-0x0000000000400000-0x000000000065E000-memory.dmp
memory/4288-50-0x0000000000400000-0x000000000065E000-memory.dmp
memory/4456-27-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-29-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-28-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-47-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-21-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-22-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-20-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-52-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-54-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-55-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-56-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4456-57-0x0000000000400000-0x0000000000537000-memory.dmp