Analysis Overview
SHA256
2274248efc8c44261f3f742f58cf46853ef66ee351b6612c6ffbfffcd06c1508
Threat Level: Known bad
The file 9c89d5c943e0569efd3d2bc58b62a4ea was found to be: Known bad.
Malicious Activity Summary
Remcos
Executes dropped EXE
Loads dropped DLL
Adds Run key to start application
Suspicious use of SetThreadContext
Unsigned PE
Enumerates physical storage devices
Program crash
Suspicious use of SetWindowsHookEx
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-02-15 00:57
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-02-15 00:57
Reported
2024-02-15 01:00
Platform
win7-20231215-en
Max time kernel
148s
Max time network
148s
Command Line
Signatures
Remcos
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\cmd.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\cmd.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\"" | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\"" | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2256 set thread context of 2916 | N/A | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe |
| PID 3024 set thread context of 2620 | N/A | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe |
Enumerates physical storage devices
Suspicious behavior: MapViewOfSection
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"
C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"
C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
Network
| Country | Destination | Domain | Proto |
| SE | 185.157.160.215:2405 | tcp | |
| SE | 185.157.160.215:2405 | tcp | |
| SE | 185.157.160.215:2405 | tcp | |
| SE | 185.157.160.215:2405 | tcp | |
| SE | 185.157.160.215:2405 | tcp | |
| SE | 185.157.160.215:2405 | tcp | |
| SE | 185.157.160.215:2405 | tcp |
Files
memory/2256-1-0x0000000000090000-0x0000000000190000-memory.dmp
memory/2256-2-0x0000000000220000-0x0000000000222000-memory.dmp
memory/2916-3-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2916-5-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2916-7-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2916-11-0x0000000000400000-0x0000000000479000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\install.vbs
| MD5 | b92d64fe5b1d1f59df4b738262aea8df |
| SHA1 | c8fb1981759c2d9bb2ec91b705985fba5fc7af63 |
| SHA256 | fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a |
| SHA512 | 2566248b93c0cfb0414f033b8dd18bbd4f88180093eac2861107289bcb4ee160f9593706ff1f7d1f2e4ecea430d67a5a2897551a4f9ebd82b707243e300520e2 |
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
| MD5 | 9c89d5c943e0569efd3d2bc58b62a4ea |
| SHA1 | 5560da6d905f87a54585d896e2d60cdd76e55f63 |
| SHA256 | 2274248efc8c44261f3f742f58cf46853ef66ee351b6612c6ffbfffcd06c1508 |
| SHA512 | 296aa08705d751fa49886bb0e669dd1b922531a30965fdf6283d4ea1908bdcc39587244527138222c9e5573fa657923a9e21f27d2a2f377d49402ef89544ce40 |
memory/2620-22-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-25-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-23-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-26-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-29-0x0000000000400000-0x0000000000479000-memory.dmp
C:\Users\Admin\AppData\Roaming\Remcos\logs.dat
| MD5 | c42b5f7aa65b005fa825285014fc8e12 |
| SHA1 | 6adaa03f43ea36028f1c228450d68d077262b845 |
| SHA256 | 49874b40248fce7e013ada47f0651eff1e39425a650b15e9cfef8d3a51ac8637 |
| SHA512 | b27fe2b46fbb8ee0525e149d2e3ed113a1ff8e455ff52c8a839a8adc50916d66d23a7eace293a4b947d45fc726f663084b978f0dd112f433adac70fab6a97190 |
memory/2620-35-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-41-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-47-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-53-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-62-0x0000000000400000-0x0000000000479000-memory.dmp
memory/2620-68-0x0000000000400000-0x0000000000479000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-02-15 00:57
Reported
2024-02-15 01:00
Platform
win10v2004-20231215-en
Max time kernel
127s
Max time network
148s
Command Line
Signatures
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1180 wrote to memory of 3924 | N/A | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe |
| PID 1180 wrote to memory of 3924 | N/A | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe |
| PID 1180 wrote to memory of 3924 | N/A | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe | C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"
C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1180 -ip 1180
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1180 -s 332
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 138.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 138.91.171.81:80 | tcp | |
| US | 8.8.8.8:53 | 154.239.44.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 178.223.142.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 81.171.91.138.in-addr.arpa | udp |
Files
memory/1180-1-0x00000000000A0000-0x00000000001A0000-memory.dmp
memory/1180-2-0x0000000000B10000-0x0000000000B12000-memory.dmp