remcos | 3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49

General

Target

3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49.dll
Size

2.0MB
MD5

35e11c13023ab1ac61074ad93aabaa91
SHA1

254d8d808f678540ff8a55836e92a444dd2d44e3
SHA256

3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49
SHA512

8d11d9320ccb86bbf0869eabb16c417d36bbe0b22d572b1cf53628a08a40fa41ffe2aa7180f13b1809408f83f1f9389643076641e6a9f7599ef8e8b308226966
SSDEEP

49152:Spa15dx9PeTsoRC2lJ9+LN8GHutn1c/GVzp1wTHyQhBCMsvEq3eBiDw0u8uWB9TE:21wTHF5svPOYDw0RrJM

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-44NBAP
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
16	5064	rundll32.exe
19	5064	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-1-5-21-2718105630-359604950-2820636825-1000\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
2616	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4672 wrote to memory of 2616	4672	rundll32.exe	83
PID 4672 wrote to memory of 2616	4672	rundll32.exe	83
PID 4672 wrote to memory of 2616	4672	rundll32.exe	83
PID 2616 wrote to memory of 5064	2616	rundll32.exe	87
PID 2616 wrote to memory of 5064	2616	rundll32.exe	87
PID 2616 wrote to memory of 5064	2616	rundll32.exe	87
PID 2616 wrote to memory of 5064	2616	rundll32.exe	87
PID 2616 wrote to memory of 5064	2616	rundll32.exe	87
PID 2616 wrote to memory of 5064	2616	rundll32.exe	87
PID 2616 wrote to memory of 1940	2616	rundll32.exe	88
PID 2616 wrote to memory of 1940	2616	rundll32.exe	88
PID 2616 wrote to memory of 1940	2616	rundll32.exe	88
PID 1940 wrote to memory of 1516	1940	cmd.exe	90
PID 1940 wrote to memory of 1516	1940	cmd.exe	90
PID 1940 wrote to memory of 1516	1940	cmd.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4672
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49.dll,#1
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2616
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - Blocklisted process makes network request
    - System Location Discovery: System Language Discovery
    PID:5064
- - 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:1940
  - - 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:1516

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/2616-2-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/2616-0-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/2616-7-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/2616-13-0x0000000010026000-0x0000000010040000-memory.dmp

Filesize
104KB

Download
memory/2616-6-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/2616-1-0x0000000010026000-0x0000000010040000-memory.dmp

Filesize
104KB

Download
memory/5064-12-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-16-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-3-0x00000000007F0000-0x00000000007F1000-memory.dmp

Filesize
4KB

Download
memory/5064-11-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-9-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-8-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-15-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-10-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-14-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-18-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-19-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-20-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-21-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-22-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download
memory/5064-23-0x0000000000760000-0x00000000007E2000-memory.dmp

Filesize
520KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads