Analysis
- max time kernel
151s - max time network
139s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
07/10/2022, 08:31
General
- Target file.exe
- Size 266KB
- Sample221007-kep7eacbgk
- SHA256 5d6e1ec4f556c929ec2c7b9b4e0ea7f14ba2e7ed61ae670fedc00e27b4b6a5f6
Malware Config
Extracted
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djvu
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http://winnlinne.com/lancer/get.php
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extension
.towz
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offline_id
SSHsHMHGmSIhrz50VnIxLJJX15osxEQY6iXedXt1
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payload_url
http://rgyui.top/dl/build2.exe
http://winnlinne.com/files/1/build3.exe
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ransomnote
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Extracted
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vidar
-
54.9
-
517
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https://t.me/larsenup
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https://ioc.exchange/@zebra54
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profile_id
517
Signatures
- Detected Djvu ransomware 10 IoCs
- Detects Smokeloader packer 2 IoCs
- Djvu Ransomware
Ransomware which is a variant of the STOP family.
- SmokeLoader
Modular backdoor trojan in use since 2014.
- Vidar
Vidar is an infostealer based on Arkei stealer.
- Downloads MZ/PE file
- Executes dropped EXE 14 IoCs
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 4 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 Microsoft Outlook profiles 1 TTPs 3 IoCs
- 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.
- Legitimate hosting services abused for malware hosting/C2 1 TTPs
- 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.
- Program crash 9 IoCs
- Checks SCSI registry key(s) 3 TTPs 6 IoCs
SCSI information is often read in order to detect sandboxing environments.
- 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.
- Modifies system certificate store 2 TTPs 3 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious behavior: MapViewOfSection 24 IoCs
- Suspicious use of AdjustPrivilegeToken 64 IoCs
- Suspicious use of WriteProcessMemory 64 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
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C:\Users\Admin\AppData\Local\Temp\4C1C.exeC:\Users\Admin\AppData\Local\Temp\4C1C.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\4C1C.exeC:\Users\Admin\AppData\Local\Temp\4C1C.exe2⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\59eec3a3-2ab5-4838-9662-fdf7aa8064f4" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\4C1C.exe"C:\Users\Admin\AppData\Local\Temp\4C1C.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\4C1C.exe"C:\Users\Admin\AppData\Local\Temp\4C1C.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\4113152a-5cb9-4a4f-8779-124e3afd74b5\build2.exe"C:\Users\Admin\AppData\Local\4113152a-5cb9-4a4f-8779-124e3afd74b5\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\4113152a-5cb9-4a4f-8779-124e3afd74b5\build2.exe"C:\Users\Admin\AppData\Local\4113152a-5cb9-4a4f-8779-124e3afd74b5\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
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C:\Users\Admin\AppData\Local\4113152a-5cb9-4a4f-8779-124e3afd74b5\build3.exe"C:\Users\Admin\AppData\Local\4113152a-5cb9-4a4f-8779-124e3afd74b5\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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-
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C:\Users\Admin\AppData\Local\Temp\50FF.exeC:\Users\Admin\AppData\Local\Temp\50FF.exe1⤵
- Executes dropped EXE
- Modifies system certificate store
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 4722⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 5642⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 5642⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 6482⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 7922⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 8242⤵
- Program crash
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C:\Windows\SysWOW64\Wbem\wmic.exewmic os get Caption2⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 13202⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 13442⤵
- Program crash
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C:\Windows\SysWOW64\cmd.execmd /C "wmic path win32_VideoController get name"2⤵
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C:\Windows\SysWOW64\Wbem\WMIC.exewmic path win32_VideoController get name3⤵
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C:\Windows\SysWOW64\cmd.execmd /C "wmic cpu get name"2⤵
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C:\Windows\SysWOW64\Wbem\WMIC.exewmic cpu get name3⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5096 -s 1402⤵
- Program crash
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C:\Users\Admin\AppData\Local\Temp\52F4.exeC:\Users\Admin\AppData\Local\Temp\52F4.exe1⤵
- Executes dropped EXE
- Checks SCSI registry key(s)
- Suspicious behavior: MapViewOfSection
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C:\Windows\system32\regsvr32.exeregsvr32 /s C:\Users\Admin\AppData\Local\Temp\574B.dll1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\574B.dll2⤵
- Loads dropped DLL
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
- Accesses Microsoft Outlook profiles
- outlook_office_path
- outlook_win_path
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C:\Windows\explorer.exeC:\Windows\explorer.exe1⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5096 -ip 50961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 5096 -ip 50961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 5096 -ip 50961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 5096 -ip 50961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 5096 -ip 50961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 5096 -ip 50961⤵
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C:\Users\Admin\AppData\Local\Temp\DE3E.exeC:\Users\Admin\AppData\Local\Temp\DE3E.exe1⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 5096 -ip 50961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 5096 -ip 50961⤵
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C:\Users\Admin\AppData\Local\Temp\E5D1.exeC:\Users\Admin\AppData\Local\Temp\E5D1.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Temp\EA75.exeC:\Users\Admin\AppData\Local\Temp\EA75.exe1⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 5096 -ip 50961⤵
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C:\Users\Admin\AppData\Local\Temp\2E0.exeC:\Users\Admin\AppData\Local\Temp\2E0.exe1⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
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C:\Windows\explorer.exeC:\Windows\explorer.exe1⤵
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
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C:\Windows\explorer.exeC:\Windows\explorer.exe1⤵
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
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C:\Windows\explorer.exeC:\Windows\explorer.exe1⤵
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
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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
Loading Replay Monitor...
Downloads
mozglue.dll
nss3.dll
07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
build2.exe
build2.exe
build2.exe
build3.exe
build3.exe
4C1C.exe
2E0.exe
2E0.exe
4C1C.exe
4C1C.exe
4C1C.exe
4C1C.exe
4C1C.exe
50FF.exe
50FF.exe
52F4.exe
52F4.exe
574B.dll
574B.dll
574B.dll
DE3E.exe
DE3E.exe
E5D1.exe
E5D1.exe
EA75.exe
EA75.exe
mstsca.exe
mstsca.exe
memory/392-250-0x0000000000680000-0x0000000000687000-memory.dmp
memory/392-279-0x0000000000680000-0x0000000000687000-memory.dmp
memory/392-251-0x0000000000670000-0x000000000067B000-memory.dmp
memory/744-285-0x0000000000DB0000-0x0000000000DB5000-memory.dmp
memory/744-268-0x0000000000DB0000-0x0000000000DB5000-memory.dmp
memory/744-269-0x0000000000DA0000-0x0000000000DA9000-memory.dmp
memory/1532-287-0x0000000000DB0000-0x0000000000DB7000-memory.dmp
memory/1532-274-0x0000000000DB0000-0x0000000000DB7000-memory.dmp
memory/1532-275-0x0000000000DA0000-0x0000000000DAD000-memory.dmp
memory/1604-284-0x0000000000710000-0x0000000000732000-memory.dmp
memory/1604-265-0x0000000000710000-0x0000000000732000-memory.dmp
memory/1604-266-0x00000000006E0000-0x0000000000707000-memory.dmp
memory/1632-184-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1632-186-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1632-227-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1632-189-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1748-166-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1748-161-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1748-165-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1748-163-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1748-180-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1872-158-0x0000000001210000-0x000000000127B000-memory.dmp
memory/1872-154-0x0000000001210000-0x000000000127B000-memory.dmp
memory/1872-153-0x0000000001280000-0x00000000012F5000-memory.dmp
memory/2028-199-0x00000000006DD000-0x0000000000708000-memory.dmp
memory/2028-201-0x00000000021E0000-0x000000000222A000-memory.dmp
memory/2036-196-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2036-207-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/2036-200-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2036-203-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2036-241-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2148-132-0x000000000072D000-0x000000000073E000-memory.dmp
memory/2148-135-0x0000000000400000-0x0000000000448000-memory.dmp
memory/2148-133-0x00000000006A0000-0x00000000006A9000-memory.dmp
memory/2148-134-0x0000000000400000-0x0000000000448000-memory.dmp
memory/2584-155-0x0000000000730000-0x000000000073C000-memory.dmp
memory/3064-271-0x0000000000570000-0x0000000000576000-memory.dmp
memory/3064-272-0x0000000000560000-0x000000000056B000-memory.dmp
memory/3064-286-0x0000000000570000-0x0000000000576000-memory.dmp
memory/3636-164-0x00000000021AF000-0x0000000002240000-memory.dmp
memory/3636-159-0x0000000002250000-0x000000000236B000-memory.dmp
memory/3644-185-0x0000000002197000-0x0000000002228000-memory.dmp
memory/3696-263-0x00000000003F0000-0x00000000003FC000-memory.dmp
memory/3696-283-0x0000000000600000-0x0000000000606000-memory.dmp
memory/3696-262-0x0000000000600000-0x0000000000606000-memory.dmp
memory/3768-168-0x0000000000480000-0x0000000000489000-memory.dmp
memory/3768-167-0x000000000063D000-0x000000000064D000-memory.dmp
memory/3768-169-0x0000000000400000-0x0000000000447000-memory.dmp
memory/3768-171-0x0000000000400000-0x0000000000447000-memory.dmp
memory/3796-259-0x0000000000DB0000-0x0000000000DB5000-memory.dmp
memory/3796-260-0x0000000000DA0000-0x0000000000DA9000-memory.dmp
memory/3796-282-0x0000000000DB0000-0x0000000000DB5000-memory.dmp
memory/3840-288-0x0000000000150000-0x0000000000158000-memory.dmp
memory/3840-278-0x0000000000140000-0x000000000014B000-memory.dmp
memory/3840-277-0x0000000000150000-0x0000000000158000-memory.dmp
memory/4348-157-0x0000000002980000-0x0000000002AC0000-memory.dmp
memory/4348-156-0x00000000026B0000-0x0000000002835000-memory.dmp
memory/4348-257-0x00000000004C0000-0x00000000004CF000-memory.dmp
memory/4348-256-0x00000000004D0000-0x00000000004D9000-memory.dmp
memory/4348-176-0x0000000002980000-0x0000000002AC0000-memory.dmp
memory/4348-173-0x0000000002B90000-0x0000000002C3D000-memory.dmp
memory/4348-172-0x0000000002AC0000-0x0000000002B81000-memory.dmp
memory/4348-151-0x0000000002230000-0x0000000002430000-memory.dmp
memory/4348-281-0x00000000004D0000-0x00000000004D9000-memory.dmp
memory/4600-280-0x0000000000400000-0x0000000000B6B000-memory.dmp
memory/4600-253-0x0000000000400000-0x0000000000B6B000-memory.dmp
memory/4600-255-0x0000000000400000-0x0000000000B6B000-memory.dmp
memory/5096-245-0x0000000000400000-0x00000000008D0000-memory.dmp
memory/5096-229-0x0000000000400000-0x00000000008D0000-memory.dmp
memory/5096-228-0x00000000030D0000-0x0000000003517000-memory.dmp