remcos | 553bd8b6c13d775bbaa9c5b2d9c02ee8df0e232180dfd17c5f7a67188bb3e218

General

Target

msimg32.dll
Size

2.0MB
MD5

76ee9007534b3b29067359f75b3e6796
SHA1

a2f76600ea6f9c62ea14e2ee0298d35901f757de
SHA256

fb0baf9e8ba136ea0c99e40f313f320f6715e47f5b947bcc0d1d2b8ce4ddeb9c
SHA512

d13f6befde057b1b0009d57ef7dc01978efde365a7427c2eea1b9708a2128b905af96600b6ac9d947f36b6399c6c170ea0e57c30dae8eaf07b8a21561861bbae
SSDEEP

24576:GoI7IMF8xqQ5Ygi0k+KieSp5Qm23cvJTnM5fMG52MRpwnQZ2o67axBCMAFvEq0cf:H55p1wTHyQhBCMsvEqyeBiDw0uJzkiai

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

privmerkt.com:6042

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
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-BMG9AW
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Blocklisted process makes network request 2 IoCs

flow	pid	Process
3	2828	rundll32.exe
6	2828	rundll32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\*ChromeUpdate = "rundll32.exe C:\\Users\\Admin\\Documents\\FirefoxData.dll,EntryPoint"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2680	rundll32.exe

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2184 wrote to memory of 2680	2184	rundll32.exe	30
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2828	2680	rundll32.exe	31
PID 2680 wrote to memory of 2628	2680	rundll32.exe	32
PID 2680 wrote to memory of 2628	2680	rundll32.exe	32
PID 2680 wrote to memory of 2628	2680	rundll32.exe	32
PID 2680 wrote to memory of 2628	2680	rundll32.exe	32
PID 2628 wrote to memory of 2584	2628	cmd.exe	34
PID 2628 wrote to memory of 2584	2628	cmd.exe	34
PID 2628 wrote to memory of 2584	2628	cmd.exe	34
PID 2628 wrote to memory of 2584	2628	cmd.exe	34

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\msimg32.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2184
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\msimg32.dll,#1
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2680
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - Blocklisted process makes network request
    - System Location Discovery: System Language Discovery
    PID:2828
- - C:\Windows\SysWOW64\cmd.exe
    cmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*ChromeUpdate" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\FirefoxData.dll",EntryPoint /f & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2628
  - - C:\Windows\SysWOW64\reg.exe
      reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*ChromeUpdate" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\FirefoxData.dll",EntryPoint /f
      4⤵
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:2584

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2680-12-0x0000000010000000-0x0000000010207000-memory.dmp

Filesize
2.0MB

Download
memory/2680-0-0x0000000010000000-0x0000000010207000-memory.dmp

Filesize
2.0MB

Download
memory/2680-1-0x0000000010026000-0x0000000010040000-memory.dmp

Filesize
104KB

Download
memory/2680-10-0x0000000010000000-0x0000000010207000-memory.dmp

Filesize
2.0MB

Download
memory/2828-4-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2828-19-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-14-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-17-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-8-0x0000000000090000-0x0000000000091000-memory.dmp

Filesize
4KB

Download
memory/2828-6-0x0000000000090000-0x0000000000091000-memory.dmp

Filesize
4KB

Download
memory/2828-3-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-16-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-18-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-13-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-20-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-21-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-25-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-24-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-26-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-28-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-29-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-32-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download
memory/2828-33-0x0000000000150000-0x00000000001D2000-memory.dmp

Filesize
520KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads