Analysis Overview
SHA256
cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2
Threat Level: Known bad
The file Sigma.exe was found to be: Known bad.
Malicious Activity Summary
Orcus
Orcus family
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Drops desktop.ini file(s)
Drops file in Windows directory
System Location Discovery: System Language Discovery
Unsigned PE
Enumerates physical storage devices
Suspicious use of SendNotifyMessage
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of WriteProcessMemory
Suspicious behavior: EnumeratesProcesses
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-11-26 19:45
Signatures
Orcus family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-11-26 19:45
Reported
2024-11-26 19:46
Platform
win7-20241010-en
Max time kernel
19s
Max time network
34s
Command Line
Signatures
Orcus
Orcus family
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2644 wrote to memory of 1144 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
| PID 2644 wrote to memory of 1144 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
| PID 2644 wrote to memory of 1144 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
| PID 2644 wrote to memory of 1144 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\Sigma.exe
"C:\Users\Admin\AppData\Local\Temp\Sigma.exe"
C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | during-interesting.gl.at.ply.gg | udp |
| US | 147.185.221.22:25798 | during-interesting.gl.at.ply.gg | tcp |
Files
memory/2644-0-0x00000000745B1000-0x00000000745B2000-memory.dmp
memory/2644-1-0x00000000745B0000-0x0000000074B5B000-memory.dmp
memory/2644-2-0x00000000745B0000-0x0000000074B5B000-memory.dmp
\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
| MD5 | d82971472daf0f83934006c25abb88f4 |
| SHA1 | 85178be08ca3583d530a87ea789e9ae4a9490c17 |
| SHA256 | cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2 |
| SHA512 | a4210167fc7c02508e708ee12bd52876413425046496fdeccd2a0313cf1260f651411a35cc2a6e5b65a30f5542aae75f1d1741d616ff79f93a48d9669e61e42f |
memory/1144-12-0x00000000745B0000-0x0000000074B5B000-memory.dmp
memory/2644-11-0x00000000745B0000-0x0000000074B5B000-memory.dmp
memory/1144-13-0x00000000745B0000-0x0000000074B5B000-memory.dmp
memory/1144-14-0x00000000745B0000-0x0000000074B5B000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\Cab8F95.tmp
| MD5 | 49aebf8cbd62d92ac215b2923fb1b9f5 |
| SHA1 | 1723be06719828dda65ad804298d0431f6aff976 |
| SHA256 | b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f |
| SHA512 | bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b |
memory/1144-31-0x00000000745B0000-0x0000000074B5B000-memory.dmp
memory/1144-32-0x00000000745B0000-0x0000000074B5B000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-11-26 19:45
Reported
2024-11-26 19:48
Platform
win10v2004-20241007-en
Max time kernel
94s
Max time network
137s
Command Line
Signatures
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Drops desktop.ini file(s)
| Description | Indicator | Process | Target |
| File created | C:\Windows\assembly\Desktop.ini | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
| File opened for modification | C:\Windows\assembly\Desktop.ini | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\assembly | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
| File created | C:\Windows\assembly\Desktop.ini | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
| File opened for modification | C:\Windows\assembly\Desktop.ini | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4572 wrote to memory of 4136 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
| PID 4572 wrote to memory of 4136 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
| PID 4572 wrote to memory of 4136 | N/A | C:\Users\Admin\AppData\Local\Temp\Sigma.exe | C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\Sigma.exe
"C:\Users\Admin\AppData\Local\Temp\Sigma.exe"
C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.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 | 103.209.201.84.in-addr.arpa | udp |
| US | 8.8.8.8:53 | during-interesting.gl.at.ply.gg | udp |
| US | 147.185.221.22:25798 | during-interesting.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 2.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 22.221.185.147.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 212.20.149.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 102.209.201.84.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 75.209.201.84.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 30.243.111.52.in-addr.arpa | udp |
Files
memory/4572-0-0x00000000754D2000-0x00000000754D3000-memory.dmp
memory/4572-1-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4572-2-0x00000000754D0000-0x0000000075A81000-memory.dmp
C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
| MD5 | d82971472daf0f83934006c25abb88f4 |
| SHA1 | 85178be08ca3583d530a87ea789e9ae4a9490c17 |
| SHA256 | cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2 |
| SHA512 | a4210167fc7c02508e708ee12bd52876413425046496fdeccd2a0313cf1260f651411a35cc2a6e5b65a30f5542aae75f1d1741d616ff79f93a48d9669e61e42f |
memory/4136-18-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4136-20-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4572-19-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4136-23-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4136-24-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4136-25-0x00000000754D0000-0x0000000075A81000-memory.dmp
memory/4136-27-0x00000000754D0000-0x0000000075A81000-memory.dmp