remcos | 3e1b557d439ca592c369de0b80c576820f61dcbc12c8babae78f3e30ba34f0af

Analysis

max time kernel
150s
max time network
148s
platform
windows10_x64
resource
win10v20201028
submitted
12/01/2021, 16:52

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General

Target
e8594ea84a7a42ce70570019cff754a6.exe
Size 1.3MB
Sample210112-2m2c4r9hex
SHA256 3e1b557d439ca592c369de0b80c576820f61dcbc12c8babae78f3e30ba34f0af
MD5 e8594ea84a7a42ce70570019cff754a6
SHA1 28c61ddbc341aff36ef147f1cb9139b7d055caf1
SHA512 2cd119489120dee762c4a7821230f05924e6c99f79d7bc54e0bd4437256ec7526b906fe8f69c959f89ab001a055d6feeaa120e1174998577b17178351c8bf1b9
MD5 SHA1 SHA512

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

swryijgrvcsgkopnmcdertvgdswbvmophtfdczxs.ydns.eu:2017

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
516	vlc.exe
3924	vlc.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\win = "\"C:\\Users\\Admin\\AppData\\Roaming\\vlc.exe\""	e8594ea84a7a42ce70570019cff754a6.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	vlc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\win = "\"C:\\Users\\Admin\\AppData\\Roaming\\vlc.exe\""	vlc.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	e8594ea84a7a42ce70570019cff754a6.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 24 IoCs

pid	Process
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 832 set thread context of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 516 set thread context of 3924	516	vlc.exe	102

Program crash 2 IoCs

pid	pid_target	Process	procid_target
996	832	WerFault.exe	67
312	516	WerFault.exe	90

Delays execution with timeout.exe 6 IoCs

evasion

pid	Process
2340	timeout.exe
936	timeout.exe
2928	timeout.exe
704	timeout.exe
3992	timeout.exe
2172	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000_Classes\Local Settings	e8594ea84a7a42ce70570019cff754a6.exe

Suspicious behavior: EnumeratesProcesses 35 IoCs

pid	Process
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
832	e8594ea84a7a42ce70570019cff754a6.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
996	WerFault.exe
516	vlc.exe
516	vlc.exe
516	vlc.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe
312	WerFault.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3924	vlc.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	832	e8594ea84a7a42ce70570019cff754a6.exe
Token: SeRestorePrivilege	996	WerFault.exe
Token: SeBackupPrivilege	996	WerFault.exe
Token: SeDebugPrivilege	996	WerFault.exe
Token: SeDebugPrivilege	516	vlc.exe
Token: SeDebugPrivilege	312	WerFault.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3924	vlc.exe

Suspicious use of WriteProcessMemory 65 IoCs

description	pid	Process	procid_target
PID 832 wrote to memory of 524	832	e8594ea84a7a42ce70570019cff754a6.exe	75
PID 832 wrote to memory of 524	832	e8594ea84a7a42ce70570019cff754a6.exe	75
PID 832 wrote to memory of 524	832	e8594ea84a7a42ce70570019cff754a6.exe	75
PID 524 wrote to memory of 2172	524	cmd.exe	77
PID 524 wrote to memory of 2172	524	cmd.exe	77
PID 524 wrote to memory of 2172	524	cmd.exe	77
PID 832 wrote to memory of 220	832	e8594ea84a7a42ce70570019cff754a6.exe	78
PID 832 wrote to memory of 220	832	e8594ea84a7a42ce70570019cff754a6.exe	78
PID 832 wrote to memory of 220	832	e8594ea84a7a42ce70570019cff754a6.exe	78
PID 220 wrote to memory of 2340	220	cmd.exe	80
PID 220 wrote to memory of 2340	220	cmd.exe	80
PID 220 wrote to memory of 2340	220	cmd.exe	80
PID 832 wrote to memory of 2956	832	e8594ea84a7a42ce70570019cff754a6.exe	81
PID 832 wrote to memory of 2956	832	e8594ea84a7a42ce70570019cff754a6.exe	81
PID 832 wrote to memory of 2956	832	e8594ea84a7a42ce70570019cff754a6.exe	81
PID 2956 wrote to memory of 936	2956	cmd.exe	83
PID 2956 wrote to memory of 936	2956	cmd.exe	83
PID 2956 wrote to memory of 936	2956	cmd.exe	83
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 832 wrote to memory of 2844	832	e8594ea84a7a42ce70570019cff754a6.exe	84
PID 2844 wrote to memory of 3384	2844	e8594ea84a7a42ce70570019cff754a6.exe	86
PID 2844 wrote to memory of 3384	2844	e8594ea84a7a42ce70570019cff754a6.exe	86
PID 2844 wrote to memory of 3384	2844	e8594ea84a7a42ce70570019cff754a6.exe	86
PID 3384 wrote to memory of 4012	3384	WScript.exe	88
PID 3384 wrote to memory of 4012	3384	WScript.exe	88
PID 3384 wrote to memory of 4012	3384	WScript.exe	88
PID 4012 wrote to memory of 516	4012	cmd.exe	90
PID 4012 wrote to memory of 516	4012	cmd.exe	90
PID 4012 wrote to memory of 516	4012	cmd.exe	90
PID 516 wrote to memory of 3756	516	vlc.exe	91
PID 516 wrote to memory of 3756	516	vlc.exe	91
PID 516 wrote to memory of 3756	516	vlc.exe	91
PID 3756 wrote to memory of 2928	3756	cmd.exe	93
PID 3756 wrote to memory of 2928	3756	cmd.exe	93
PID 3756 wrote to memory of 2928	3756	cmd.exe	93
PID 516 wrote to memory of 2788	516	vlc.exe	94
PID 516 wrote to memory of 2788	516	vlc.exe	94
PID 516 wrote to memory of 2788	516	vlc.exe	94
PID 2788 wrote to memory of 704	2788	cmd.exe	96
PID 2788 wrote to memory of 704	2788	cmd.exe	96
PID 2788 wrote to memory of 704	2788	cmd.exe	96
PID 516 wrote to memory of 2104	516	vlc.exe	99
PID 516 wrote to memory of 2104	516	vlc.exe	99
PID 516 wrote to memory of 2104	516	vlc.exe	99
PID 2104 wrote to memory of 3992	2104	cmd.exe	101
PID 2104 wrote to memory of 3992	2104	cmd.exe	101
PID 2104 wrote to memory of 3992	2104	cmd.exe	101
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102
PID 516 wrote to memory of 3924	516	vlc.exe	102

C:\Users\Admin\AppData\Local\Temp\e8594ea84a7a42ce70570019cff754a6.exe
"C:\Users\Admin\AppData\Local\Temp\e8594ea84a7a42ce70570019cff754a6.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:832
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:524
- - C:\Windows\SysWOW64\timeout.exe
    timeout 1
    3⤵
    - Delays execution with timeout.exe
    PID:2172
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:220
- - C:\Windows\SysWOW64\timeout.exe
    timeout 1
    3⤵
    - Delays execution with timeout.exe
    PID:2340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2956
- - C:\Windows\SysWOW64\timeout.exe
    timeout 1
    3⤵
    - Delays execution with timeout.exe
    PID:936
- C:\Users\Admin\AppData\Local\Temp\e8594ea84a7a42ce70570019cff754a6.exe
  "C:\Users\Admin\AppData\Local\Temp\e8594ea84a7a42ce70570019cff754a6.exe"
  2⤵
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2844
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3384
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\vlc.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4012
    - - C:\Users\Admin\AppData\Roaming\vlc.exe
        
        C:\Users\Admin\AppData\Roaming\vlc.exe
        5⤵
        Executes dropped EXE
        Suspicious use of NtSetInformationThreadHideFromDebugger
        Suspicious use of SetThreadContext
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:516
      - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c timeout 1
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:3756
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout 1
        7⤵
        Delays execution with timeout.exe
        
        PID:2928
      - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c timeout 1
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:2788
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout 1
        7⤵
        Delays execution with timeout.exe
        
        PID:704
      - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c timeout 1
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:2104
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout 1
        7⤵
        Delays execution with timeout.exe
        
        PID:3992
      - C:\Users\Admin\AppData\Roaming\vlc.exe
        
        "C:\Users\Admin\AppData\Roaming\vlc.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        
        PID:3924
      - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 516 -s 1652
        6⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:312
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 832 -s 1544
  2⤵
  - Program crash
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:996

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/312-46-0x0000000004E80000-0x0000000004E81000-memory.dmp

Download

memory/516-28-0x0000000073BB0000-0x000000007429E000-memory.dmp

Download

memory/832-8-0x00000000051E0000-0x0000000005211000-memory.dmp

Download

memory/832-13-0x0000000006260000-0x0000000006261000-memory.dmp

Download

memory/832-7-0x0000000004F40000-0x0000000004F41000-memory.dmp

Download

memory/832-6-0x0000000005060000-0x0000000005061000-memory.dmp

Download

memory/832-2-0x0000000073BB0000-0x000000007429E000-memory.dmp

Download

memory/832-5-0x0000000004FC0000-0x0000000004FC1000-memory.dmp

Download

memory/832-3-0x0000000000610000-0x0000000000611000-memory.dmp

Download

memory/996-21-0x00000000041D0000-0x00000000041D1000-memory.dmp

Download

memory/2844-18-0x0000000000400000-0x0000000000421000-memory.dmp

Download

memory/2844-16-0x0000000000400000-0x0000000000421000-memory.dmp

Download

memory/3924-45-0x0000000000400000-0x0000000000421000-memory.dmp

Download