Analysis Overview
SHA256
4a2b8775c52b3594c1e8889afdf96c1477853d5b912b3ede8248fa306da74bcd
Threat Level: Known bad
The file 63f2fc876c09c7a6a1700612e479f251_JaffaCakes118 was found to be: Known bad.
Malicious Activity Summary
Darkcomet
Modifies WinLogon for persistence
Drops file in Drivers directory
Executes dropped EXE
UPX packed file
Uses the VBS compiler for execution
Checks BIOS information in registry
Adds Run key to start application
Suspicious use of SetThreadContext
Unsigned PE
Suspicious use of WriteProcessMemory
Enumerates system info in registry
Checks processor information in registry
Modifies registry class
Suspicious use of AdjustPrivilegeToken
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-07-22 16:38
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-07-22 16:38
Reported
2024-07-22 16:40
Platform
win7-20240704-en
Max time kernel
13s
Max time network
19s
Command Line
Signatures
Darkcomet
Modifies WinLogon for persistence
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\AppData\\Roaming\\Windows\\Updates\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Drops file in Drivers directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\drivers\etc\hosts | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
UPX packed file
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
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Uses the VBS compiler for execution
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2212144002-1172735686-1556890956-1000\Software\Microsoft\Windows\CurrentVersion\Run\WinUpdater32 = "C:\\Users\\Admin\\AppData\\Roaming\\Windows\\Updates\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2304 set thread context of 2268 | N/A | C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe |
| PID 2268 set thread context of 2640 | N/A | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | C:\Windows\SysWOW64\explorer.exe |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe"
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\Windows\SysWOW64\explorer.exe
"C:\Windows\SysWOW64\explorer.exe"
Network
Files
memory/2304-0-0x00000000748B1000-0x00000000748B2000-memory.dmp
memory/2304-1-0x00000000748B0000-0x0000000074E5B000-memory.dmp
memory/2304-2-0x00000000748B0000-0x0000000074E5B000-memory.dmp
memory/2268-3-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-13-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-12-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-11-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
memory/2268-7-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-5-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2304-14-0x00000000748B0000-0x0000000074E5B000-memory.dmp
memory/2268-15-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-18-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-19-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-20-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-17-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2268-16-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2640-29-0x0000000000400000-0x000000000051E000-memory.dmp
memory/2640-27-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
memory/2268-33-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/2640-25-0x0000000000400000-0x000000000051E000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-07-22 16:38
Reported
2024-07-22 16:40
Platform
win10v2004-20240709-en
Max time kernel
148s
Max time network
150s
Command Line
Signatures
Darkcomet
Modifies WinLogon for persistence
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\AppData\\Roaming\\Windows\\Updates\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Drops file in Drivers directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\drivers\etc\hosts | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe | N/A |
UPX packed file
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Uses the VBS compiler for execution
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-384068567-2943195810-3631207890-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinUpdater32 = "C:\\Users\\Admin\\AppData\\Roaming\\Windows\\Updates\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1508 set thread context of 5116 | N/A | C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\ | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe"
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\Windows\SysWOW64\explorer.exe
"C:\Windows\SysWOW64\explorer.exe"
C:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe
"C:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 104.219.191.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 133.211.185.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 103.169.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 99.58.20.217.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 73.144.22.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 29.243.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
Files
memory/1508-0-0x00000000751E2000-0x00000000751E3000-memory.dmp
memory/1508-1-0x00000000751E0000-0x0000000075791000-memory.dmp
memory/1508-2-0x00000000751E0000-0x0000000075791000-memory.dmp
memory/5116-3-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/5116-4-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/5116-6-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/5116-7-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/5116-8-0x0000000000400000-0x00000000004B5000-memory.dmp
memory/1508-10-0x00000000751E0000-0x0000000075791000-memory.dmp
memory/5116-9-0x0000000000400000-0x00000000004B5000-memory.dmp
C:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe
| MD5 | d881de17aa8f2e2c08cbb7b265f928f9 |
| SHA1 | 08936aebc87decf0af6e8eada191062b5e65ac2a |
| SHA256 | b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0 |
| SHA512 | 5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34 |
memory/5116-72-0x0000000000400000-0x00000000004B5000-memory.dmp