remcos | 3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
06/09/2024, 14:40

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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

privmerkt.com:6042

nwemarkets.com:5290

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 3 IoCs

flow	pid	Process
21	2828	rundll32.exe
24	2828	rundll32.exe
26	2828	rundll32.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	rundll32.exe

Executes dropped EXE 2 IoCs

pid	Process
1716	res_out.exe
3556	res_out.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\*ChromeUpdate = "rundll32.exe C:\\Users\\Admin\\Documents\\FirefoxData.dll,EntryPoint"	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NostaAshamed = "C:\\Users\\Admin\\Pictures\\NssClipper\\ClipperNss.exe"	res_out.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4900	rundll32.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	res_out.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	res_out.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1424 wrote to memory of 4900	1424	rundll32.exe	90
PID 1424 wrote to memory of 4900	1424	rundll32.exe	90
PID 1424 wrote to memory of 4900	1424	rundll32.exe	90
PID 4900 wrote to memory of 2828	4900	rundll32.exe	103
PID 4900 wrote to memory of 2828	4900	rundll32.exe	103
PID 4900 wrote to memory of 2828	4900	rundll32.exe	103
PID 4900 wrote to memory of 2828	4900	rundll32.exe	103
PID 4900 wrote to memory of 2828	4900	rundll32.exe	103
PID 4900 wrote to memory of 2828	4900	rundll32.exe	103
PID 4900 wrote to memory of 2480	4900	rundll32.exe	104
PID 4900 wrote to memory of 2480	4900	rundll32.exe	104
PID 4900 wrote to memory of 2480	4900	rundll32.exe	104
PID 2480 wrote to memory of 4140	2480	cmd.exe	106
PID 2480 wrote to memory of 4140	2480	cmd.exe	106
PID 2480 wrote to memory of 4140	2480	cmd.exe	106
PID 2828 wrote to memory of 1716	2828	rundll32.exe	107
PID 2828 wrote to memory of 1716	2828	rundll32.exe	107
PID 2828 wrote to memory of 1716	2828	rundll32.exe	107
PID 1716 wrote to memory of 3556	1716	res_out.exe	108
PID 1716 wrote to memory of 3556	1716	res_out.exe	108
PID 1716 wrote to memory of 3556	1716	res_out.exe	108
PID 1716 wrote to memory of 3556	1716	res_out.exe	108
PID 1716 wrote to memory of 3556	1716	res_out.exe	108

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\3c911df5b86df9712bf5f14ff49c3beadb62cbde886609139c437bf0a919fc49.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1424
- 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:4900
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - Blocklisted process makes network request
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2828
  - - C:\Users\Admin\AppData\Local\Temp\res_out.exe
      "C:\Users\Admin\AppData\Local\Temp\res_out.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1716
    - - C:\Users\Admin\AppData\Local\Temp\res_out.exe
        
        "C:\Users\Admin\AppData\Local\Temp\res_out.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        
        PID:3556
- - 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:2480
  - - 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:4140

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4408,i,1330210614411927383,9239043499051775691,262144 --variations-seed-version --mojo-platform-channel-handle=4448 /prefetch:8
1⤵
PID:848

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

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\res_out.exe

Filesize
4.3MB

MD5
7d1aa3c4ff291fd0b72132e0cffce746

SHA1
5333ec6264b52bfa2da39653bb41d0499779e1cd

SHA256
43fc3b5ab0764c06f9d62ec5f4458c13df381a4334f8019d1906ea76d68e149d

SHA512
f02b6ec4f62f1aabd19a5c784f8e906b0340314da36ec3eae6961ffdb7ace591ed0706121ef168d87ed931f60478b01fe5527d63ff615904fed62ea95ceab936

Download Submit
memory/1716-39-0x0000000000400000-0x0000000000855000-memory.dmp

Filesize
4.3MB

Download
memory/1716-40-0x0000000000400000-0x0000000000855000-memory.dmp

Filesize
4.3MB

Download
memory/1716-35-0x0000000000400000-0x0000000000855000-memory.dmp

Filesize
4.3MB

Download
memory/1716-36-0x0000000000400000-0x0000000000855000-memory.dmp

Filesize
4.3MB

Download
memory/1716-37-0x0000000000400000-0x0000000000855000-memory.dmp

Filesize
4.3MB

Download
memory/1716-34-0x0000000000400000-0x0000000000855000-memory.dmp

Filesize
4.3MB

Download
memory/2828-13-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-9-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-11-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-12-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-60-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-14-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-15-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-17-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-57-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-2-0x0000000000940000-0x0000000000941000-memory.dmp

Filesize
4KB

Download
memory/2828-29-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-31-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-32-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-33-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-56-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-7-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-53-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-6-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-52-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/2828-10-0x00000000008B0000-0x0000000000932000-memory.dmp

Filesize
520KB

Download
memory/3556-43-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-38-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-59-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-44-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-45-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-46-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-47-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-51-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-50-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-42-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-58-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/3556-54-0x0000000000860000-0x00000000008E2000-memory.dmp

Filesize
520KB

Download
memory/4900-8-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/4900-19-0x0000000010026000-0x0000000010040000-memory.dmp

Filesize
104KB

Download
memory/4900-5-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/4900-0-0x0000000010000000-0x0000000010204000-memory.dmp

Filesize
2.0MB

Download
memory/4900-1-0x0000000010026000-0x0000000010040000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads