Analysis Overview
SHA256
a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1
Threat Level: Known bad
The file a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1 was found to be: Known bad.
Malicious Activity Summary
Darkcomet
Modifies WinLogon for persistence
Checks BIOS information in registry
Adds Run key to start application
Suspicious use of SetThreadContext
Drops file in Windows directory
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2022-10-19 14:20
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2022-10-19 14:20
Reported
2022-10-19 15:32
Platform
win7-20220901-en
Max time kernel
150s
Max time network
49s
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:\\Windows\\Minidump\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Windows\SysWOW64\explorer.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Windows\\Minidump\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Windows\\Minidump\\winupdate.exe" | C:\Windows\SysWOW64\notepad.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1492 set thread context of 1688 | N/A | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe |
| PID 1688 set thread context of 1648 | N/A | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | C:\Windows\SysWOW64\explorer.exe |
| PID 1648 set thread context of 288 | N/A | C:\Windows\SysWOW64\explorer.exe | C:\Windows\SysWOW64\explorer.exe |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\Minidump\winupdate.exe | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| File opened for modification | C:\Windows\Minidump\winupdate.exe | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| File opened for modification | C:\Windows\Minidump\ | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| File created | C:\Windows\Minidump\winupdate.exe | C:\Windows\SysWOW64\notepad.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Windows\SysWOW64\explorer.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\explorer.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe
"C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe"
C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe
C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe
C:\Windows\SysWOW64\notepad.exe
notepad
C:\Windows\SysWOW64\explorer.exe
"C:\Windows\SysWOW64\explorer.exe"
C:\Windows\SysWOW64\explorer.exe
C:\Windows\SysWOW64\explorer.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
Files
memory/1688-56-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-57-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-59-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-61-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-63-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-65-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-66-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-68-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-70-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-72-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1688-71-0x00000000131D08B4-mapping.dmp
memory/1688-73-0x0000000076BA1000-0x0000000076BA3000-memory.dmp
memory/1688-74-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/540-75-0x0000000000000000-mapping.dmp
memory/1648-77-0x0000000000400000-0x0000000000509000-memory.dmp
memory/1648-79-0x0000000000400000-0x0000000000509000-memory.dmp
memory/1648-80-0x00000000004027FC-mapping.dmp
memory/1688-82-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/1648-83-0x0000000000400000-0x0000000000509000-memory.dmp
memory/288-101-0x00000000131D08B4-mapping.dmp
memory/1648-103-0x0000000000400000-0x0000000000509000-memory.dmp
memory/288-105-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/288-106-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/288-107-0x0000000013140000-0x00000000131F6000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2022-10-19 14:20
Reported
2022-10-19 15:32
Platform
win10v2004-20220901-en
Max time kernel
151s
Max time network
155s
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:\\Windows\\Minidump\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Windows\SysWOW64\explorer.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Windows\\Minidump\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Windows\\Minidump\\winupdate.exe" | C:\Windows\SysWOW64\notepad.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2548 set thread context of 3800 | N/A | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe |
| PID 3800 set thread context of 3988 | N/A | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | C:\Windows\SysWOW64\explorer.exe |
| PID 3988 set thread context of 224 | N/A | C:\Windows\SysWOW64\explorer.exe | C:\Windows\SysWOW64\explorer.exe |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\Minidump\winupdate.exe | C:\Windows\SysWOW64\notepad.exe | N/A |
| File created | C:\Windows\Minidump\winupdate.exe | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| File opened for modification | C:\Windows\Minidump\winupdate.exe | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| File opened for modification | C:\Windows\Minidump\ | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\SysWOW64\explorer.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Windows\SysWOW64\explorer.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Windows\SysWOW64\explorer.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\explorer.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe
"C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe"
C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe
C:\Users\Admin\AppData\Local\Temp\a6d76883d5738a91a8e9c9d6761bc378abccebc864eaf0ec986905add29b8aa1.exe
C:\Windows\SysWOW64\notepad.exe
notepad
C:\Windows\SysWOW64\explorer.exe
"C:\Windows\SysWOW64\explorer.exe"
C:\Windows\SysWOW64\explorer.exe
C:\Windows\SysWOW64\explorer.exe
Network
| Country | Destination | Domain | Proto |
| US | 209.197.3.8:80 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 209.197.3.8:80 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 20.189.173.5:443 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| NL | 104.80.225.205:443 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 209.197.3.8:80 | tcp | |
| US | 209.197.3.8:80 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 209.197.3.8:80 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| DE | 8.248.93.254:80 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 13.107.42.16:443 | tcp | |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
| US | 8.8.8.8:53 | deco63.no-ip.org | udp |
Files
memory/3800-134-0x0000000000000000-mapping.dmp
memory/3800-135-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/3800-136-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/3800-137-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/2844-138-0x0000000000000000-mapping.dmp
memory/3988-139-0x0000000000000000-mapping.dmp
memory/3988-140-0x0000000000400000-0x0000000000509000-memory.dmp
memory/3800-142-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/3988-143-0x0000000000400000-0x0000000000509000-memory.dmp
memory/3988-146-0x0000000000400000-0x0000000000509000-memory.dmp
memory/224-147-0x0000000000000000-mapping.dmp
memory/3988-151-0x0000000000400000-0x0000000000509000-memory.dmp
memory/224-150-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/224-152-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/224-153-0x0000000013140000-0x00000000131F6000-memory.dmp