Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
06/03/2024, 13:56
General
- Target fb8ddd837ad8b94f1faf0b4920ce7b2b.exe
- Size 161KB
- Sample240306-q8ntbscd7s
- SHA256 29645afd1579bf501163d73ffb4cefe7043e85b47f030a2c633d721a9b10efee
Malware Config
Extracted
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smokeloader
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pub1
Extracted
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smokeloader
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2022
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http://trad-einmyus.com/index.php
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http://tradein-myus.com/index.php
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http://trade-inmyus.com/index.php
Extracted
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djvu
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http://sajdfue.com/test1/get.php
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extension
.wisz
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offline_id
4p0Nzrg1q0ND5of5Gtp2UBjthSXuE8VxnMrd4vt1
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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
- Detected Djvu ransomware 9 IoCs
- Djvu Ransomware
Ransomware which is a variant of the STOP family.
- SmokeLoader
Modular backdoor trojan in use since 2014.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Deletes itself 1 IoCs
- Executes dropped EXE 4 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 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of SetThreadContext 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Checks SCSI registry key(s) 3 TTPs 3 IoCs
SCSI information is often read in order to detect sandboxing environments.
- Modifies registry class 2 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: MapViewOfSection 1 IoCs
- Suspicious use of AdjustPrivilegeToken 6 IoCs
- Suspicious use of WriteProcessMemory 29 IoCs
- 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\fb8ddd837ad8b94f1faf0b4920ce7b2b.exe"C:\Users\Admin\AppData\Local\Temp\fb8ddd837ad8b94f1faf0b4920ce7b2b.exe"1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
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C:\Users\Admin\AppData\Local\Temp\EDCB.exeC:\Users\Admin\AppData\Local\Temp\EDCB.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\EDCB.exeC:\Users\Admin\AppData\Local\Temp\EDCB.exe2⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\0897cd0c-4761-4015-ad9f-c554b833dbc4" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\EDCB.exe"C:\Users\Admin\AppData\Local\Temp\EDCB.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\EDCB.exe"C:\Users\Admin\AppData\Local\Temp\EDCB.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3448 -s 5685⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3448 -ip 34481⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
EDCB.exe
memory/3292-2-0x0000000002060000-0x000000000206B000-memory.dmp
memory/3292-3-0x0000000000400000-0x0000000001F00000-memory.dmp
memory/3292-5-0x0000000000400000-0x0000000001F00000-memory.dmp
memory/3292-1-0x00000000020B0000-0x00000000021B0000-memory.dmp
memory/3380-4-0x0000000003260000-0x0000000003276000-memory.dmp
memory/3448-38-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3448-41-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3448-39-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3804-16-0x0000000003C10000-0x0000000003CA3000-memory.dmp
memory/3804-17-0x0000000003CB0000-0x0000000003DCB000-memory.dmp
memory/4624-20-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4624-32-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4624-22-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4624-21-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4624-18-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4860-35-0x0000000003C10000-0x0000000003CAA000-memory.dmp