remcos | be0874a5aac730116aa21f21765232ae5ef951d8714c9eff0e5f3aa23edfbdd0

Analysis

max time kernel
148s
max time network
150s
platform
windows10_x64
resource
win10v20201028
submitted
27/11/2020, 15:22

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General

Target
PaymentRemittanceInfo.exe
Size 205KB
Sample201127-gpade5w3tn
SHA256 be0874a5aac730116aa21f21765232ae5ef951d8714c9eff0e5f3aa23edfbdd0
MD5 a426addb754c42706c56f857191d9f6c
SHA1 fdbc48bdd27259e462ffe82593cfd9a507998f44
SHA512 f502deda759fd36ce7e66f1f7a5900299d39a63ec0b38895c4cf165c3e6fd4ee3b515336b0823231450ae5316d12de6a7ca4a26357145e53c90b0a371a2d1908
MD5 SHA1 SHA512

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

89.249.74.213:40511

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
1876	msworrd.exe
2712	msworrd.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-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	PaymentRemittanceInfo.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\mswordlive = "\"C:\\Windows\\SysWOW64\\mssofficee\\msworrd.exe\""	PaymentRemittanceInfo.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	msworrd.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\mswordlive = "\"C:\\Windows\\SysWOW64\\mssofficee\\msworrd.exe\""	msworrd.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\mssofficee\msworrd.exe	PaymentRemittanceInfo.exe
File opened for modification	C:\Windows\SysWOW64\mssofficee\msworrd.exe	PaymentRemittanceInfo.exe
File opened for modification	C:\Windows\SysWOW64\logs.dat	msworrd.exe
File created	C:\Windows\SysWOW64\logs.dat	msworrd.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2604 set thread context of 2068	2604	PaymentRemittanceInfo.exe	79
PID 1876 set thread context of 2712	1876	msworrd.exe	84
PID 2712 set thread context of 760	2712	msworrd.exe	85

Modifies registry class 1 IoCs

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

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2604	PaymentRemittanceInfo.exe
2604	PaymentRemittanceInfo.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2712	msworrd.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2604	PaymentRemittanceInfo.exe
Token: SeDebugPrivilege	1876	msworrd.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2712	msworrd.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 2604 wrote to memory of 3864	2604	PaymentRemittanceInfo.exe	78
PID 2604 wrote to memory of 3864	2604	PaymentRemittanceInfo.exe	78
PID 2604 wrote to memory of 3864	2604	PaymentRemittanceInfo.exe	78
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2604 wrote to memory of 2068	2604	PaymentRemittanceInfo.exe	79
PID 2068 wrote to memory of 2008	2068	PaymentRemittanceInfo.exe	80
PID 2068 wrote to memory of 2008	2068	PaymentRemittanceInfo.exe	80
PID 2068 wrote to memory of 2008	2068	PaymentRemittanceInfo.exe	80
PID 2008 wrote to memory of 2680	2008	WScript.exe	81
PID 2008 wrote to memory of 2680	2008	WScript.exe	81
PID 2008 wrote to memory of 2680	2008	WScript.exe	81
PID 2680 wrote to memory of 1876	2680	cmd.exe	83
PID 2680 wrote to memory of 1876	2680	cmd.exe	83
PID 2680 wrote to memory of 1876	2680	cmd.exe	83
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 1876 wrote to memory of 2712	1876	msworrd.exe	84
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85
PID 2712 wrote to memory of 760	2712	msworrd.exe	85

C:\Users\Admin\AppData\Local\Temp\PaymentRemittanceInfo.exe
"C:\Users\Admin\AppData\Local\Temp\PaymentRemittanceInfo.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2604
- C:\Users\Admin\AppData\Local\Temp\PaymentRemittanceInfo.exe
  "C:\Users\Admin\AppData\Local\Temp\PaymentRemittanceInfo.exe"
  2⤵
  PID:3864
- C:\Users\Admin\AppData\Local\Temp\PaymentRemittanceInfo.exe
  "C:\Users\Admin\AppData\Local\Temp\PaymentRemittanceInfo.exe"
  2⤵
  - Adds Run key to start application
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2068
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2008
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\mssofficee\msworrd.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2680
    - - C:\Windows\SysWOW64\mssofficee\msworrd.exe
        
        C:\Windows\SysWOW64\mssofficee\msworrd.exe
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1876
      - C:\Windows\SysWOW64\mssofficee\msworrd.exe
        
        "C:\Windows\SysWOW64\mssofficee\msworrd.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Drops file in System32 directory
        Suspicious use of SetThreadContext
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2712
        
        C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        7⤵
        
        PID:760

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/760-1523-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/1876-783-0x0000000073940000-0x000000007402E000-memory.dmp

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memory/2068-774-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2068-776-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2604-771-0x00000000187E0000-0x00000000187E1000-memory.dmp

Download

memory/2604-773-0x0000000018880000-0x0000000018896000-memory.dmp

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memory/2604-772-0x00000000187B0000-0x00000000187B1000-memory.dmp

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memory/2604-2-0x0000000073940000-0x000000007402E000-memory.dmp

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memory/2604-8-0x0000000008B90000-0x0000000008BDC000-memory.dmp

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memory/2604-7-0x0000000005710000-0x0000000005711000-memory.dmp

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memory/2604-6-0x0000000005620000-0x0000000005621000-memory.dmp

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memory/2604-5-0x0000000005B20000-0x0000000005B21000-memory.dmp

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memory/2604-3-0x0000000000D40000-0x0000000000D41000-memory.dmp

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