remcos | 62e736ac20a8fe8f037bd5d44e3a6081fd67d53c0d5e047b30c39cb6c838833b

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
04-12-2024 14:18

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General

Target

62e736ac20a8fe8f037bd5d44e3a6081fd67d53c0d5e047b30c39cb6c838833b.dll
Size

3.5MB
MD5

e5d93e71e121c8bcbe965ed765d1ef36
SHA1

78a990827dc002ecb62be89c994110abd8c1e880
SHA256

62e736ac20a8fe8f037bd5d44e3a6081fd67d53c0d5e047b30c39cb6c838833b
SHA512

7589f612684f88918ea0b5721855e20f84093e65e2cb7bb607c26bf355db24c5e344a1c63dc95defbae22f83931e7de5b8b13b5a8e19d596d795ce57d5d631bd
SSDEEP

49152:i5Xob/BJCgLzDdwd9bk/RiF6xQf2V4dNgqjEBaWFnMpuIU2GiD:0A/BSY/RiAxpVgdqaWGpU2GiD

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

pattreon.duckdns.org:7035

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-QI1BME
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
Remcos family
remcos

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\*ChromeUpdate = "rundll32.exe C:\\Users\\Admin\\Documents\\FirefoxData.dll,EntryPoint"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

Processes:

regsvr32.exe

pid	Process
2424	regsvr32.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

Processes:

regsvr32.exeregsvr32.execmd.exereg.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.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 15 IoCs

Processes:

regsvr32.exeregsvr32.execmd.exe

description	pid	Process	procid_target
PID 4640 wrote to memory of 2424	4640	regsvr32.exe	83
PID 4640 wrote to memory of 2424	4640	regsvr32.exe	83
PID 4640 wrote to memory of 2424	4640	regsvr32.exe	83
PID 2424 wrote to memory of 4752	2424	regsvr32.exe	92
PID 2424 wrote to memory of 4752	2424	regsvr32.exe	92
PID 2424 wrote to memory of 4752	2424	regsvr32.exe	92
PID 2424 wrote to memory of 4752	2424	regsvr32.exe	92
PID 2424 wrote to memory of 4752	2424	regsvr32.exe	92
PID 2424 wrote to memory of 4752	2424	regsvr32.exe	92
PID 2424 wrote to memory of 5012	2424	regsvr32.exe	97
PID 2424 wrote to memory of 5012	2424	regsvr32.exe	97
PID 2424 wrote to memory of 5012	2424	regsvr32.exe	97
PID 5012 wrote to memory of 1736	5012	cmd.exe	99
PID 5012 wrote to memory of 1736	5012	cmd.exe	99
PID 5012 wrote to memory of 1736	5012	cmd.exe	99

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\62e736ac20a8fe8f037bd5d44e3a6081fd67d53c0d5e047b30c39cb6c838833b.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:4640
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\62e736ac20a8fe8f037bd5d44e3a6081fd67d53c0d5e047b30c39cb6c838833b.dll
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2424
- - C:\Windows\SysWOW64\regsvr32.exe
    "C:\Windows\SysWOW64\regsvr32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4752
- - 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:5012
  - - 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:1736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2424-1-0x0000000010007000-0x0000000010021000-memory.dmp

Filesize
104KB

Download
memory/2424-0-0x0000000010000000-0x0000000010398000-memory.dmp

Filesize
3.6MB

Download
memory/2424-6-0x0000000010000000-0x0000000010398000-memory.dmp

Filesize
3.6MB

Download
memory/2424-5-0x0000000010000000-0x0000000010398000-memory.dmp

Filesize
3.6MB

Download
memory/2424-18-0x0000000010007000-0x0000000010021000-memory.dmp

Filesize
104KB

Download
memory/4752-2-0x0000000000D50000-0x0000000000D51000-memory.dmp

Filesize
4KB

Download
memory/4752-7-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-8-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-10-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-11-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-12-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-13-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-14-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-15-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-16-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-19-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-20-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-21-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-22-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-23-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-24-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-25-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-26-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-27-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-28-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-29-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-30-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-31-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-32-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-33-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-34-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-35-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-36-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-37-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-38-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-39-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-40-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-41-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-42-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-43-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-44-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-45-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-46-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-47-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-48-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-49-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-50-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-51-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-52-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-53-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-54-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-55-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-56-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-57-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-58-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-59-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-60-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-61-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-62-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-63-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-64-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-65-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-66-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download
memory/4752-67-0x0000000000CC0000-0x0000000000D42000-memory.dmp

Filesize
520KB

Download