remcos | e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8

Analysis

max time kernel
150s
max time network
148s
platform
windows10_x64
resource
win10v20201028
submitted
17-02-2021 21:12

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General

Target

Quotation6547558,pdf.exe
Size

706KB
MD5

8dbeaa2200e3dd4d09247606d25bec31
SHA1

72265ac4686a37571cdd1f7a6961853de166dc00
SHA256

e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8
SHA512

c73fbe6c7300ccb33e6b293ab6218d605e52e20651a3bf22f2c51b2326fe63bd7b4b0978dbd190d714c3d889eb2d9256c62722d2180eba1e082db531d30f3ef2

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

favour2021.ddns.net:1990

Signatures

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

Executes dropped EXE 2 IoCs

Processes:

remcos.exeremcos.exe

pid	Process
1124	remcos.exe
3452	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

remcos.exeQuotation6547558,pdf.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	Quotation6547558,pdf.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	Quotation6547558,pdf.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

Quotation6547558,pdf.exeremcos.exe

description	pid	Process	procid_target
PID 1048 set thread context of 2848	1048	Quotation6547558,pdf.exe	82
PID 1124 set thread context of 3452	1124	remcos.exe	89

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 2 IoCs

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

persistence

Scheduled Task

T1053

Processes:

schtasks.exeschtasks.exe

pid	Process
3404	schtasks.exe
3184	schtasks.exe

Modifies registry class 1 IoCs

Processes:

Quotation6547558,pdf.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000_Classes\Local Settings	Quotation6547558,pdf.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

Quotation6547558,pdf.exeremcos.exe

pid	Process
1048	Quotation6547558,pdf.exe
1048	Quotation6547558,pdf.exe
1048	Quotation6547558,pdf.exe
1124	remcos.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Quotation6547558,pdf.exeremcos.exe

description	pid	Process
Token: SeDebugPrivilege	1048	Quotation6547558,pdf.exe
Token: SeDebugPrivilege	1124	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

remcos.exe

pid	Process
3452	remcos.exe

Suspicious use of WriteProcessMemory 38 IoCs

Processes:

Quotation6547558,pdf.exeQuotation6547558,pdf.exeWScript.execmd.exeremcos.exe

description	pid	Process	procid_target
PID 1048 wrote to memory of 3404	1048	Quotation6547558,pdf.exe	79
PID 1048 wrote to memory of 3404	1048	Quotation6547558,pdf.exe	79
PID 1048 wrote to memory of 3404	1048	Quotation6547558,pdf.exe	79
PID 1048 wrote to memory of 1372	1048	Quotation6547558,pdf.exe	81
PID 1048 wrote to memory of 1372	1048	Quotation6547558,pdf.exe	81
PID 1048 wrote to memory of 1372	1048	Quotation6547558,pdf.exe	81
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 2848 wrote to memory of 2296	2848	Quotation6547558,pdf.exe	83
PID 2848 wrote to memory of 2296	2848	Quotation6547558,pdf.exe	83
PID 2848 wrote to memory of 2296	2848	Quotation6547558,pdf.exe	83
PID 2296 wrote to memory of 2096	2296	WScript.exe	84
PID 2296 wrote to memory of 2096	2296	WScript.exe	84
PID 2296 wrote to memory of 2096	2296	WScript.exe	84
PID 2096 wrote to memory of 1124	2096	cmd.exe	86
PID 2096 wrote to memory of 1124	2096	cmd.exe	86
PID 2096 wrote to memory of 1124	2096	cmd.exe	86
PID 1124 wrote to memory of 3184	1124	remcos.exe	87
PID 1124 wrote to memory of 3184	1124	remcos.exe	87
PID 1124 wrote to memory of 3184	1124	remcos.exe	87
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89

C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1048
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rtzecNlXv" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8EF2.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:3404
- C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe"
  2⤵
  PID:1372
- C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe"
  2⤵
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2848
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2296
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2096
    - - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1124
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rtzecNlXv" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8F9A.tmp"
        6⤵
        Creates scheduled task(s)
        
        PID:3184
      - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:3452

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

C:\Users\Admin\AppData\Local\Temp\install.vbs

MD5
b92d64fe5b1d1f59df4b738262aea8df

SHA1
c8fb1981759c2d9bb2ec91b705985fba5fc7af63

SHA256
fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a

SHA512
2566248b93c0cfb0414f033b8dd18bbd4f88180093eac2861107289bcb4ee160f9593706ff1f7d1f2e4ecea430d67a5a2897551a4f9ebd82b707243e300520e2

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp8EF2.tmp

MD5
55f5ae6343be9fa5d56526298d490c0e

SHA1
b17922f6191226b0227914ab9e1b85cbb9a0c902

SHA256
9febb50f41f75e5dc4e0a0433ea7ed99a31d6295f7efe7fd0df8458de383fd17

SHA512
68f39717a329a944f35f93d5a7734adba2a420dfa76431c05ad8a52bcd45a1f187f01d65b108317645d63b160f2f2db04124f5ad90f93ad07e2b5ca8d09b68ec

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp8F9A.tmp

MD5
55f5ae6343be9fa5d56526298d490c0e

SHA1
b17922f6191226b0227914ab9e1b85cbb9a0c902

SHA256
9febb50f41f75e5dc4e0a0433ea7ed99a31d6295f7efe7fd0df8458de383fd17

SHA512
68f39717a329a944f35f93d5a7734adba2a420dfa76431c05ad8a52bcd45a1f187f01d65b108317645d63b160f2f2db04124f5ad90f93ad07e2b5ca8d09b68ec

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

MD5
8dbeaa2200e3dd4d09247606d25bec31

SHA1
72265ac4686a37571cdd1f7a6961853de166dc00

SHA256
e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8

SHA512
c73fbe6c7300ccb33e6b293ab6218d605e52e20651a3bf22f2c51b2326fe63bd7b4b0978dbd190d714c3d889eb2d9256c62722d2180eba1e082db531d30f3ef2

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

MD5
8dbeaa2200e3dd4d09247606d25bec31

SHA1
72265ac4686a37571cdd1f7a6961853de166dc00

SHA256
e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8

SHA512
c73fbe6c7300ccb33e6b293ab6218d605e52e20651a3bf22f2c51b2326fe63bd7b4b0978dbd190d714c3d889eb2d9256c62722d2180eba1e082db531d30f3ef2

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

MD5
8dbeaa2200e3dd4d09247606d25bec31

SHA1
72265ac4686a37571cdd1f7a6961853de166dc00

SHA256
e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8

SHA512
c73fbe6c7300ccb33e6b293ab6218d605e52e20651a3bf22f2c51b2326fe63bd7b4b0978dbd190d714c3d889eb2d9256c62722d2180eba1e082db531d30f3ef2

Download Submit
memory/1048-7-0x0000000004C00000-0x0000000004C01000-memory.dmp

Filesize
4KB

Download
memory/1048-10-0x0000000004DD0000-0x0000000004DD1000-memory.dmp

Filesize
4KB

Download
memory/1048-11-0x0000000004B30000-0x0000000004B33000-memory.dmp

Filesize
12KB

Download
memory/1048-12-0x00000000057C0000-0x0000000005815000-memory.dmp

Filesize
340KB

Download
memory/1048-9-0x0000000004CA0000-0x0000000004CA1000-memory.dmp

Filesize
4KB

Download
memory/1048-8-0x0000000004AE0000-0x0000000004AE1000-memory.dmp

Filesize
4KB

Download
memory/1048-6-0x0000000005060000-0x0000000005061000-memory.dmp

Filesize
4KB

Download
memory/1048-2-0x0000000073460000-0x0000000073B4E000-memory.dmp

Filesize
6.9MB

Download
memory/1048-5-0x0000000004A20000-0x0000000004A21000-memory.dmp

Filesize
4KB

Download
memory/1048-3-0x0000000000040000-0x0000000000041000-memory.dmp

Filesize
4KB

Download
memory/1124-24-0x0000000073460000-0x0000000073B4E000-memory.dmp

Filesize
6.9MB

Download
memory/1124-21-0x0000000000000000-mapping.dmp

Download
memory/1124-33-0x00000000055B0000-0x00000000055B1000-memory.dmp

Filesize
4KB

Download
memory/2096-20-0x0000000000000000-mapping.dmp

Download
memory/2296-18-0x0000000000000000-mapping.dmp

Download
memory/2848-17-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2848-16-0x0000000000413FA4-mapping.dmp

Download
memory/2848-15-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3184-35-0x0000000000000000-mapping.dmp

Download
memory/3404-13-0x0000000000000000-mapping.dmp

Download
memory/3452-38-0x0000000000413FA4-mapping.dmp

Download
memory/3452-40-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download