Analysis
- max time kernel
150s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
16/01/2024, 01:24
General
- Target toolspub2.exe
- Size 255KB
- Sample240116-bsdabsadej
- SHA256 461f0f86f52bfa5fbed84023d0a9c8652bcbca34fea76ad0cb5bb8c503b65c9a
Malware Config
Extracted
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smokeloader
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up3
Extracted
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smokeloader
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2020
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http://host-file-host6.com/
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http://host-host-file8.com/
Extracted
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djvu
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http://habrafa.com/test1/get.php
-
extension
.cdpo
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offline_id
Bn3q97hwLouKbhkQRNO4SeV07gjdEQVm8NKhg0t1
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payload_url
http://brusuax.com/dl/build2.exe
http://habrafa.com/files/1/build3.exe
-
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 6 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 2 IoCs
- Checks SCSI registry key(s) 3 TTPs 3 IoCs
SCSI information is often read in order to detect sandboxing environments.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: MapViewOfSection 1 IoCs
- Suspicious use of AdjustPrivilegeToken 12 IoCs
- Suspicious use of UnmapMainImage 1 IoCs
- Suspicious use of WriteProcessMemory 42 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\toolspub2.exe"C:\Users\Admin\AppData\Local\Temp\toolspub2.exe"1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3040 -s 3682⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 3040 -ip 30401⤵
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C:\Windows\system32\reg.exereg add "HKEY_CURRENT_USER\Software\clicker\key" /v primary /t REG_DWORD /d 11⤵
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\D188.bat" "1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\reg.exereg add "HKEY_CURRENT_USER\Software\clicker\key" /v primary /t REG_DWORD /d 11⤵
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\D571.bat" "1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\B38.exeC:\Users\Admin\AppData\Local\Temp\B38.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\B38.exeC:\Users\Admin\AppData\Local\Temp\B38.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\c9142965-5ae8-48ac-9435-7fc1040e9f2b" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\B38.exe"C:\Users\Admin\AppData\Local\Temp\B38.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\B38.exe"C:\Users\Admin\AppData\Local\Temp\B38.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3428 -ip 34281⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3428 -s 5681⤵
- Program crash
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C:\Users\Admin\AppData\Local\Temp\3542.exeC:\Users\Admin\AppData\Local\Temp\3542.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Temp\40EB.exeC:\Users\Admin\AppData\Local\Temp\40EB.exe1⤵
- Executes dropped EXE
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
3542.exe
3542.exe
40EB.exe
40EB.exe
B38.exe
D188.bat
memory/1308-46-0x0000000002570000-0x000000000260A000-memory.dmp
memory/2504-65-0x0000000001580000-0x0000000001581000-memory.dmp
memory/2504-75-0x0000000002610000-0x000000000272B000-memory.dmp
memory/2504-64-0x0000000002610000-0x000000000272B000-memory.dmp
memory/2504-62-0x00000000006C0000-0x0000000001137000-memory.dmp
memory/2504-58-0x00000000006C0000-0x0000000001137000-memory.dmp
memory/3040-8-0x0000000000400000-0x0000000000862000-memory.dmp
memory/3040-4-0x0000000000400000-0x0000000000862000-memory.dmp
memory/3040-3-0x0000000000400000-0x0000000000862000-memory.dmp
memory/3040-2-0x00000000008F0000-0x00000000008F9000-memory.dmp
memory/3040-1-0x0000000000A50000-0x0000000000B50000-memory.dmp
memory/3400-5-0x0000000000840000-0x0000000000856000-memory.dmp
memory/3428-52-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3428-50-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3428-49-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3860-70-0x000002B226F10000-0x000002B22703E000-memory.dmp
memory/3860-74-0x00007FFE1F190000-0x00007FFE1FC51000-memory.dmp
memory/3860-71-0x000002B241580000-0x000002B2416B2000-memory.dmp
memory/3860-72-0x00007FFE1F190000-0x00007FFE1FC51000-memory.dmp
memory/3860-73-0x000002B2416C0000-0x000002B2416D0000-memory.dmp
memory/4100-31-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4100-29-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4100-30-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4100-27-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4100-43-0x0000000000400000-0x0000000000537000-memory.dmp
memory/5108-26-0x0000000002710000-0x000000000282B000-memory.dmp
memory/5108-25-0x0000000002560000-0x0000000002600000-memory.dmp