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Analysis
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max time kernel
142s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
06/04/2024, 13:21
Static task
static1
Behavioral task
behavioral1
Sample
c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe
Resource
win10v2004-20240226-en
Behavioral task
behavioral2
Sample
c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe
Resource
win11-20240214-en
General
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Target
c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe
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Size
825KB
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MD5
a396fe245f20167c4ca851964a04ed82
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SHA1
649c7f054b8ea9ea85b2471e48c16256ff9bdb06
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SHA256
c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d
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SHA512
adf814dbdf0232f6fc600d80c8931a603807902ac64214fc1a6f7af4611f3a539edd9e08eb219b767f9e7693d8423e3943d0bccc9c10454b81a8a3529a2d519a
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SSDEEP
12288:+e7f6+LF0YaGXLrS/Kxs/al3diVHJQqYmjXiHIqluOiwuvE1CDpPksEWo:+e7HKYafxilEVHJPYmioqluOUc2Zo
Malware Config
Extracted
djvu
http://sajdfue.com/test2/get.php
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extension
.uazq
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offline_id
Jx0i3k2ogR5cKxX1evmz0Ex7TUxOUlnbh2dvnIt1
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payload_url
http://sdfjhuz.com/dl/build2.exe
http://sajdfue.com/files/1/build3.exe
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ransomnote
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Signatures
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Detected Djvu ransomware 9 IoCs
resource yara_rule behavioral1/memory/4732-2-0x0000000004AC0000-0x0000000004BDB000-memory.dmp family_djvu behavioral1/memory/4288-3-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4288-4-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4288-5-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4288-6-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4288-15-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/3636-20-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/3636-21-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/3636-23-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\Control Panel\International\Geo\Nation c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 5048 icacls.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\21109f57-f652-48a3-a5e2-9d23166a34c6\\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe\" --AutoStart" c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe -
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 7 api.2ip.ua 8 api.2ip.ua -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 4732 set thread context of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4380 set thread context of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Program crash 1 IoCs
pid pid_target Process procid_target 1324 3636 WerFault.exe 94 -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe -
Suspicious use of WriteProcessMemory 26 IoCs
description pid Process procid_target PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4732 wrote to memory of 4288 4732 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 88 PID 4288 wrote to memory of 5048 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 89 PID 4288 wrote to memory of 5048 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 89 PID 4288 wrote to memory of 5048 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 89 PID 4288 wrote to memory of 4380 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 90 PID 4288 wrote to memory of 4380 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 90 PID 4288 wrote to memory of 4380 4288 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 90 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94 PID 4380 wrote to memory of 3636 4380 c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe 94
Processes
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C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe"C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4732 -
C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe"C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4288 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\21109f57-f652-48a3-a5e2-9d23166a34c6" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:5048
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C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe"C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4380 -
C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe"C:\Users\Admin\AppData\Local\Temp\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe" --Admin IsNotAutoStart IsNotTask4⤵PID:3636
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3636 -s 5685⤵
- Program crash
PID:1324
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3636 -ip 36361⤵PID:4984
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\21109f57-f652-48a3-a5e2-9d23166a34c6\c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d.exe
Filesize825KB
MD5a396fe245f20167c4ca851964a04ed82
SHA1649c7f054b8ea9ea85b2471e48c16256ff9bdb06
SHA256c40bf84f9b9f88fa2d444c53ce49f4f52df0fc39f6f564246144a3f53595bf8d
SHA512adf814dbdf0232f6fc600d80c8931a603807902ac64214fc1a6f7af4611f3a539edd9e08eb219b767f9e7693d8423e3943d0bccc9c10454b81a8a3529a2d519a