Analysis
- max time kernel
65s - max time network
144s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
22/12/2022, 07:51
General
- Target c62a82ed1318f259a6fadeb7b5d5fdb0.exe
- Size 747KB
- Sample221222-jptrxahc6t
- SHA256 2aab7d77e68c9d9a52d25e20e6a06c2a4b29c5fdae70b56eb5525b693899ef35
Malware Config
Extracted
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djvu
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http://abibiall.com/test1/get.php
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extension
.isal
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offline_id
m3KmScxfDyEQzJYP8qjOSfP4FvpsOXlekGuMPzt1
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payload_url
http://uaery.top/dl/build2.exe
http://abibiall.com/files/1/build3.exe
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ransomnote
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Signatures
- Detected Djvu ransomware 11 IoCs
- Djvu Ransomware
Ransomware which is a variant of the STOP family.
- Downloads MZ/PE file
- Executes dropped EXE 4 IoCs
- Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 2 IoCs
- Modifies file permissions 1 TTPs 1 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses 2FA software files, possible credential harvesting 2 TTPs
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- 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). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious use of WriteProcessMemory 53 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe"C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe"C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.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\554ba8c8-1262-4e41-b50b-237cec1f4038" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe"C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe"C:\Users\Admin\AppData\Local\Temp\c62a82ed1318f259a6fadeb7b5d5fdb0.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build2.exe"C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build2.exe"C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build2.exe"6⤵
- Executes dropped EXE
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build2.exe" & exit7⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build3.exe"C:\Users\Admin\AppData\Local\1b31f7cf-9c21-46eb-a570-b224b1e271ec\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"6⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"2⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
mozglue.dll
nss3.dll
07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
build2.exe
build2.exe
build2.exe
build3.exe
build3.exe
c62a82ed1318f259a6fadeb7b5d5fdb0.exe
mstsca.exe
mstsca.exe
memory/320-161-0x0000000000868000-0x0000000000896000-memory.dmp
memory/320-163-0x00000000020A0000-0x00000000020F3000-memory.dmp
memory/3176-169-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3176-145-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3176-147-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3176-148-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3400-160-0x0000000000400000-0x0000000000467000-memory.dmp
memory/3400-162-0x0000000000400000-0x0000000000467000-memory.dmp
memory/3400-158-0x0000000000400000-0x0000000000467000-memory.dmp
memory/3400-165-0x0000000000400000-0x0000000000467000-memory.dmp
memory/3400-170-0x0000000060900000-0x0000000060992000-memory.dmp
memory/3400-192-0x0000000000400000-0x0000000000467000-memory.dmp
memory/4288-138-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4288-136-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4288-142-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4288-134-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4288-133-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4916-146-0x00000000007CF000-0x0000000000861000-memory.dmp
memory/5100-137-0x0000000002290000-0x00000000023AB000-memory.dmp
memory/5100-135-0x0000000000624000-0x00000000006B6000-memory.dmp
memory/5100-156-0x0000000002290000-0x00000000023AB000-memory.dmp