remcos | 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086

Analysis

max time kernel
130s
max time network
41s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
12/10/2022, 04:47

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General

Target
2588905afa71212e998ca44aabbebe40.exe
Size 975KB
Sample221012-fejbmscdg2
SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
MD5 2588905afa71212e998ca44aabbebe40
SHA1 1ca03e71ca3a4a96910e9ada59ff7388d8d3a012
SHA512 7156eb0b1d87403683334ea18222abef6e219c7d81466fb9b712accd270bb209ca7b02fbf061570cfd15fc7cb7f05f7e76b04abb283669647b2cb146cd28f952
SSDEEP 24576:Bwuu1QQ6ieC+qPJSjeQGn06kfcyuF+O91jrxE:uBGQ4C+QSjet/TyufG
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos remotehost persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

37.0.14.206:6081

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-04LFTW
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Executes dropped EXE 1 IoCs

pid	Process
1884	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
988	cmd.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\	2588905afa71212e998ca44aabbebe40.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	2588905afa71212e998ca44aabbebe40.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	2588905afa71212e998ca44aabbebe40.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	2588905afa71212e998ca44aabbebe40.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2036 set thread context of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
828	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2036	2588905afa71212e998ca44aabbebe40.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2036	2588905afa71212e998ca44aabbebe40.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2036 wrote to memory of 828	2036	2588905afa71212e998ca44aabbebe40.exe	27
PID 2036 wrote to memory of 828	2036	2588905afa71212e998ca44aabbebe40.exe	27
PID 2036 wrote to memory of 828	2036	2588905afa71212e998ca44aabbebe40.exe	27
PID 2036 wrote to memory of 828	2036	2588905afa71212e998ca44aabbebe40.exe	27
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 2036 wrote to memory of 1820	2036	2588905afa71212e998ca44aabbebe40.exe	29
PID 1820 wrote to memory of 1640	1820	2588905afa71212e998ca44aabbebe40.exe	30
PID 1820 wrote to memory of 1640	1820	2588905afa71212e998ca44aabbebe40.exe	30
PID 1820 wrote to memory of 1640	1820	2588905afa71212e998ca44aabbebe40.exe	30
PID 1820 wrote to memory of 1640	1820	2588905afa71212e998ca44aabbebe40.exe	30
PID 1640 wrote to memory of 988	1640	WScript.exe	31
PID 1640 wrote to memory of 988	1640	WScript.exe	31
PID 1640 wrote to memory of 988	1640	WScript.exe	31
PID 1640 wrote to memory of 988	1640	WScript.exe	31
PID 988 wrote to memory of 1884	988	cmd.exe	33
PID 988 wrote to memory of 1884	988	cmd.exe	33
PID 988 wrote to memory of 1884	988	cmd.exe	33
PID 988 wrote to memory of 1884	988	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\2588905afa71212e998ca44aabbebe40.exe
"C:\Users\Admin\AppData\Local\Temp\2588905afa71212e998ca44aabbebe40.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2036
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GXLFiDFJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp37B.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:828
- C:\Users\Admin\AppData\Local\Temp\2588905afa71212e998ca44aabbebe40.exe
  "{path}"
  2⤵
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:1820
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1640
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:988
    - - C:\ProgramData\Remcos\remcos.exe
        
        C:\ProgramData\Remcos\remcos.exe
        5⤵
        Executes dropped EXE
        
        PID:1884

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

remcos.exe

Path C:\ProgramData\Remcos\remcos.exe
Size 975KB
SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
MD5 2588905afa71212e998ca44aabbebe40
SHA1 1ca03e71ca3a4a96910e9ada59ff7388d8d3a012
SHA512 7156eb0b1d87403683334ea18222abef6e219c7d81466fb9b712accd270bb209ca7b02fbf061570cfd15fc7cb7f05f7e76b04abb283669647b2cb146cd28f952
SSDEEP 24576:Bwuu1QQ6ieC+qPJSjeQGn06kfcyuF+O91jrxE:uBGQ4C+QSjet/TyufG
MD5 SHA1 SHA512 SSDEEP

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remcos.exe

Path C:\ProgramData\Remcos\remcos.exe
Size 975KB
SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
MD5 2588905afa71212e998ca44aabbebe40
SHA1 1ca03e71ca3a4a96910e9ada59ff7388d8d3a012
SHA512 7156eb0b1d87403683334ea18222abef6e219c7d81466fb9b712accd270bb209ca7b02fbf061570cfd15fc7cb7f05f7e76b04abb283669647b2cb146cd28f952
SSDEEP 24576:Bwuu1QQ6ieC+qPJSjeQGn06kfcyuF+O91jrxE:uBGQ4C+QSjet/TyufG
MD5 SHA1 SHA512 SSDEEP

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install.vbs

Path C:\Users\Admin\AppData\Local\Temp\install.vbs
Size 386B
SHA256 6efdc40f9eb217f879607614e928b65bff759e424f3efb31faceb2a043c32dc2
MD5 1ec6289c6fd4c2ded6b2836ed28cbeb5
SHA1 c4e08195e6c640eb8860acc03fda1d649b4fe070
SHA512 20bc46f4dee22f75f15c402c7c2eaee60fff7dd92548050585571dcbefd59485cc249c06bc3f1aac7a138e5ae67c0c3918b46ffa24c8b0f1b092e2f6b6e21288
MD5 SHA1 SHA512

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tmp37B.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp37B.tmp
Size 1KB
SHA256 27b8c0db6af76d6e8838145a8bb15c266eb77de6723bbefe1d3eecc214f4425b
MD5 5971ed027e6e65dc67b6007af8083469
SHA1 70f48724f3edabbe59c3d394dec1285474c50b5c
SHA512 6592de902bcbe48adc74f5c0511b7381f8ba93347c5a6fd5ec59210471fd4d85a68700be23b564ef9ca762a9d5503e35e5bfedad06d447d8e1ee25e745aba102
MD5 SHA1 SHA512

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remcos.exe

Path \ProgramData\Remcos\remcos.exe
Size 975KB
SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
MD5 2588905afa71212e998ca44aabbebe40
SHA1 1ca03e71ca3a4a96910e9ada59ff7388d8d3a012
SHA512 7156eb0b1d87403683334ea18222abef6e219c7d81466fb9b712accd270bb209ca7b02fbf061570cfd15fc7cb7f05f7e76b04abb283669647b2cb146cd28f952
SSDEEP 24576:Bwuu1QQ6ieC+qPJSjeQGn06kfcyuF+O91jrxE:uBGQ4C+QSjet/TyufG
MD5 SHA1 SHA512 SSDEEP

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memory/1820-73-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-66-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-77-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-68-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-69-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-71-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-61-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-64-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-62-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-67-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1820-79-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/1884-87-0x0000000000D30000-0x0000000000E2A000-memory.dmp

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memory/2036-54-0x0000000000010000-0x000000000010A000-memory.dmp

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memory/2036-56-0x0000000001D60000-0x0000000001D80000-memory.dmp

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memory/2036-57-0x0000000004C40000-0x0000000004CFE000-memory.dmp

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memory/2036-55-0x0000000075C61000-0x0000000075C63000-memory.dmp

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memory/2036-58-0x00000000042A0000-0x000000000431C000-memory.dmp

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