remcos | b510777cb941685b861542ecbe45fc585f6a658eb5725e2f97f35b4edffbd95d

Analysis

max time kernel
149s
max time network
153s
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 14:16

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General

Target

b510777cb941685b861542ecbe45fc585f6a658eb5725e2f97f35b4edffbd95d.dll
Size

45.1MB
MD5

cf9b7d8e67d72c9a77fe5bb40444cb09
SHA1

76e957318e75339774f8ae6df3cbcc010b9fdff9
SHA256

b510777cb941685b861542ecbe45fc585f6a658eb5725e2f97f35b4edffbd95d
SHA512

0fa43b293a3d2e9b7bd2668894ae4b3984cf7fcb0562f70cd9b997f85d070e55bb9873e03dd7494fed57c10f2346da4b2447b31fd01b4d1a809290c33ee28cfd
SSDEEP

786432:5UP7GCGO7t0Srkx/tC0SzIdSwh/WxbpNHQD3trzRpq:5UP7GCG6iSrkx1hSzYsHQD3t/R8

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-S4KRD7
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-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\*ChromeUpdate = "rundll32.exe C:\\Users\\Admin\\Documents\\ChromeData.dll,EntryPoint"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

Processes:

regsvr32.exe

pid	Process
4284	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 4928 wrote to memory of 4284	4928	regsvr32.exe	85
PID 4928 wrote to memory of 4284	4928	regsvr32.exe	85
PID 4928 wrote to memory of 4284	4928	regsvr32.exe	85
PID 4284 wrote to memory of 4540	4284	regsvr32.exe	92
PID 4284 wrote to memory of 4540	4284	regsvr32.exe	92
PID 4284 wrote to memory of 4540	4284	regsvr32.exe	92
PID 4284 wrote to memory of 4540	4284	regsvr32.exe	92
PID 4284 wrote to memory of 4540	4284	regsvr32.exe	92
PID 4284 wrote to memory of 4540	4284	regsvr32.exe	92
PID 4284 wrote to memory of 1844	4284	regsvr32.exe	98
PID 4284 wrote to memory of 1844	4284	regsvr32.exe	98
PID 4284 wrote to memory of 1844	4284	regsvr32.exe	98
PID 1844 wrote to memory of 2268	1844	cmd.exe	100
PID 1844 wrote to memory of 2268	1844	cmd.exe	100
PID 1844 wrote to memory of 2268	1844	cmd.exe	100

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\b510777cb941685b861542ecbe45fc585f6a658eb5725e2f97f35b4edffbd95d.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:4928
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\b510777cb941685b861542ecbe45fc585f6a658eb5725e2f97f35b4edffbd95d.dll
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4284
- - C:\Windows\SysWOW64\regsvr32.exe
    "C:\Windows\SysWOW64\regsvr32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4540
- - 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\ChromeData.dll",EntryPoint /f & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1844
  - - 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\ChromeData.dll",EntryPoint /f
      4⤵
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:2268

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/4284-1-0x00000000102E6000-0x0000000010300000-memory.dmp

Filesize
104KB

Download
memory/4284-0-0x0000000010000000-0x0000000012DD7000-memory.dmp

Filesize
45.8MB

Download
memory/4284-9-0x0000000010000000-0x0000000012DD7000-memory.dmp

Filesize
45.8MB

Download
memory/4284-4-0x0000000010000000-0x0000000012DD7000-memory.dmp

Filesize
45.8MB

Download
memory/4284-14-0x0000000012D70000-0x0000000012D77000-memory.dmp

Filesize
28KB

Download
memory/4284-16-0x00000000102E6000-0x0000000010300000-memory.dmp

Filesize
104KB

Download
memory/4540-34-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-10-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-8-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-6-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-37-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-11-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-12-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-13-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-15-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-17-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-18-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-19-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-20-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-21-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-22-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-23-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-24-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-25-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-26-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-27-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-28-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-29-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-30-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-31-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-32-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-33-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-2-0x00000000010E0000-0x00000000010E1000-memory.dmp

Filesize
4KB

Download
memory/4540-35-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-65-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-5-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-38-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-39-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-40-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-41-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-42-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-43-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-44-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-45-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-46-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-47-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-48-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-49-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-50-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-51-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-52-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-53-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-54-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-55-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-56-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-57-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-58-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-59-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-60-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-61-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-62-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-63-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-64-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-36-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-66-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download
memory/4540-67-0x0000000001050000-0x00000000010D2000-memory.dmp

Filesize
520KB

Download