Analysis
- max time kernel
138s - max time network
155s - platform
windows10_x64 - resource
win10-en - submitted
09/09/2021, 11:58
Static task
static1
Behavioral task
behavioral1
Sample
c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe
Resource
win7-en
Behavioral task
behavioral2
Sample
c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe
Resource
win10-en
General
- Target c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe
- Size 792KB
- Sample210909-n471asbcel
- SHA256 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f
- MD5 57171a379041d8c06e0b75be89294a13
- SHA1 22455d2e62d52efc7a9c6e767148e70e5f284fc3
- SHA512 d61278b64158815370e3d554faf94fdf2c89134401e6963e728e60dd6dca101dc18f74dcb08e1375acd13d53c992914239a5aebbaa2f6238b1638940daec6f15
- MD5 SHA1 SHA512
Malware Config
Extracted
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vidar
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40.5
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517
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https://gheorghip.tumblr.com/
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profile_id
517
Signatures
- Detected Djvu ransomeware 8 IoCs
resource yara_rule behavioral2/memory/2824-115-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2824-116-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/3668-117-0x0000000004140000-0x000000000425B000-memory.dmp family_djvu behavioral2/memory/2824-118-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1452-123-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/1452-124-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1568-150-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/1568-152-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu - Djvu Ransomware
Ransomware which is a variant of the STOP family.
- suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
- suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
- suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
- suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
- Vidar Stealer 4 IoCs
resource yara_rule behavioral2/memory/1876-133-0x000000000049EC7D-mapping.dmp family_vidar behavioral2/memory/1876-132-0x0000000000400000-0x00000000004D5000-memory.dmp family_vidar behavioral2/memory/1876-136-0x0000000000400000-0x00000000004D5000-memory.dmp family_vidar behavioral2/memory/3604-135-0x0000000002550000-0x0000000002622000-memory.dmp family_vidar - Downloads MZ/PE file
- Executes dropped EXE 4 IoCs
pid Process 3604 build2.exe 1876 build2.exe 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 1568 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe - Loads dropped DLL 2 IoCs
pid Process 1876 build2.exe 1876 build2.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 1020 icacls.exe - Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\d7e8a533-1b9a-457b-8948-0f22361380b9\\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe\" --AutoStart" c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe - 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 4 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 12 api.2ip.ua 13 api.2ip.ua 20 api.2ip.ua 39 api.2ip.ua - Suspicious use of SetThreadContext 4 IoCs
description pid Process procid_target PID 3668 set thread context of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3184 set thread context of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3604 set thread context of 1876 3604 build2.exe 85 PID 2392 set thread context of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 - 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.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 build2.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString build2.exe - Delays execution with timeout.exe 1 IoCs
pid Process 3856 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 2236 taskkill.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe - Suspicious behavior: EnumeratesProcesses 14 IoCs
pid Process 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 1452 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 1452 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 1876 build2.exe 1876 build2.exe 1876 build2.exe 1876 build2.exe 1876 build2.exe 1876 build2.exe 1876 build2.exe 1876 build2.exe 1568 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 1568 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe - Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2236 taskkill.exe - Suspicious use of WriteProcessMemory 56 IoCs
description pid Process procid_target PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 3668 wrote to memory of 2824 3668 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 75 PID 2824 wrote to memory of 1020 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 77 PID 2824 wrote to memory of 1020 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 77 PID 2824 wrote to memory of 1020 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 77 PID 2824 wrote to memory of 3184 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 78 PID 2824 wrote to memory of 3184 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 78 PID 2824 wrote to memory of 3184 2824 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 78 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 3184 wrote to memory of 1452 3184 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 80 PID 1452 wrote to memory of 3604 1452 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 84 PID 1452 wrote to memory of 3604 1452 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 84 PID 1452 wrote to memory of 3604 1452 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 84 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 3604 wrote to memory of 1876 3604 build2.exe 85 PID 1876 wrote to memory of 2288 1876 build2.exe 86 PID 1876 wrote to memory of 2288 1876 build2.exe 86 PID 1876 wrote to memory of 2288 1876 build2.exe 86 PID 2288 wrote to memory of 2236 2288 cmd.exe 88 PID 2288 wrote to memory of 2236 2288 cmd.exe 88 PID 2288 wrote to memory of 2236 2288 cmd.exe 88 PID 2288 wrote to memory of 3856 2288 cmd.exe 89 PID 2288 wrote to memory of 3856 2288 cmd.exe 89 PID 2288 wrote to memory of 3856 2288 cmd.exe 89 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91 PID 2392 wrote to memory of 1568 2392 c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe"C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3668 -
C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe"C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe"2⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2824 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\d7e8a533-1b9a-457b-8948-0f22361380b9" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:1020
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C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe"C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3184 -
C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe"C:\Users\Admin\AppData\Local\Temp\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1452 -
C:\Users\Admin\AppData\Local\14415a33-7dd2-4be7-9748-3f972992342e\build2.exe"C:\Users\Admin\AppData\Local\14415a33-7dd2-4be7-9748-3f972992342e\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3604 -
C:\Users\Admin\AppData\Local\14415a33-7dd2-4be7-9748-3f972992342e\build2.exe"C:\Users\Admin\AppData\Local\14415a33-7dd2-4be7-9748-3f972992342e\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1876 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\14415a33-7dd2-4be7-9748-3f972992342e\build2.exe" & del C:\ProgramData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:2288 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im build2.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:2236
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:3856
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C:\Users\Admin\AppData\Local\d7e8a533-1b9a-457b-8948-0f22361380b9\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exeC:\Users\Admin\AppData\Local\d7e8a533-1b9a-457b-8948-0f22361380b9\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe --Task1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2392 -
C:\Users\Admin\AppData\Local\d7e8a533-1b9a-457b-8948-0f22361380b9\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exeC:\Users\Admin\AppData\Local\d7e8a533-1b9a-457b-8948-0f22361380b9\c90d3fe9641d27a59510e20001bc315dc1b76972f03e910e2d71bd6cde0e983f.exe --Task2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:1568
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