remcos | f02671c1ed8c3250c20f7127f30f7a0ac5bd307037d19c0a1ffa8609fab885d4

General

Target

Inquiry_021.exe
Size

662KB
MD5

cc3cbd404637528b33657439499d1a0f
SHA1

fa3524ddbeecc9d4d6ba119c92a98b687d929f86
SHA256

37202bff2f4f2bf175036758b0f31ddc52de619ee0590a3fb93d3d70ee8a68ec
SHA512

574c437b6b92f30ad06a025ac138f2ab07701438f30906fceaff6bb560d5a7bff7589f01d60af2b17c56c9c114003775b4dfa1cca064ed3aa1e344767eadbe3b
SSDEEP

12288:3pxEDrQY5EvoFzhlmTS1i4jkkg52CKRC8fZ9G/dZBihAxYbM:Za8voVOIObYfZoEAQM

Score

10^/10

remcos host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

185.140.53.4:7289

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
Newback.exe
copy_folder
NewBack
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
remcos_rmdouoggtyiykbl
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	Inquiry_021.exe

Executes dropped EXE 2 IoCs

pid	Process
3916	Newback.exe
4928	Newback.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-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\NewBack\\Newback.exe\""	Inquiry_021.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\NewBack\\Newback.exe\""	Newback.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 624 set thread context of 2576	624	Inquiry_021.exe	83
PID 3916 set thread context of 4928	3916	Newback.exe	91

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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Newback.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Newback.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Inquiry_021.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Inquiry_021.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4716	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4716	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
624	Inquiry_021.exe
624	Inquiry_021.exe
3916	Newback.exe
3916	Newback.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
624	Inquiry_021.exe
3916	Newback.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4928	Newback.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 624 wrote to memory of 2576	624	Inquiry_021.exe	83
PID 624 wrote to memory of 2576	624	Inquiry_021.exe	83
PID 624 wrote to memory of 2576	624	Inquiry_021.exe	83
PID 2576 wrote to memory of 936	2576	Inquiry_021.exe	86
PID 2576 wrote to memory of 936	2576	Inquiry_021.exe	86
PID 2576 wrote to memory of 936	2576	Inquiry_021.exe	86
PID 936 wrote to memory of 4716	936	cmd.exe	88
PID 936 wrote to memory of 4716	936	cmd.exe	88
PID 936 wrote to memory of 4716	936	cmd.exe	88
PID 936 wrote to memory of 3916	936	cmd.exe	90
PID 936 wrote to memory of 3916	936	cmd.exe	90
PID 936 wrote to memory of 3916	936	cmd.exe	90
PID 3916 wrote to memory of 4928	3916	Newback.exe	91
PID 3916 wrote to memory of 4928	3916	Newback.exe	91
PID 3916 wrote to memory of 4928	3916	Newback.exe	91

C:\Users\Admin\AppData\Local\Temp\Inquiry_021.exe
"C:\Users\Admin\AppData\Local\Temp\Inquiry_021.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:624
- C:\Users\Admin\AppData\Local\Temp\Inquiry_021.exe
  "C:\Users\Admin\AppData\Local\Temp\Inquiry_021.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2576
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:936
  - - C:\Windows\SysWOW64\PING.EXE
      PING 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4716
  - - C:\Users\Admin\AppData\Roaming\NewBack\Newback.exe
      "C:\Users\Admin\AppData\Roaming\NewBack\Newback.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:3916
    - - C:\Users\Admin\AppData\Roaming\NewBack\Newback.exe
        
        "C:\Users\Admin\AppData\Roaming\NewBack\Newback.exe"
        5⤵
        Executes dropped EXE
        Adds Run key to start application
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:4928

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
101B

MD5
c015be9fb2f6f14177e7fb701440db71

SHA1
37864a27bae359472a1d7bc163872f985114b4f3

SHA256
02e3c8c541f3bd020a229c37b7b45d446fdf7325d8ccd122d35be62f424a9b5e

SHA512
bb43e53d59ae0b7770ed2f9db74a224093692462102f0911a6be45392ff9f793e7770b382b9c8655196a914c181293ec468634955f598f2f706da4335491cf7c

Download Submit
C:\Users\Admin\AppData\Roaming\NewBack\Newback.exe

Filesize
662KB

MD5
cc3cbd404637528b33657439499d1a0f

SHA1
fa3524ddbeecc9d4d6ba119c92a98b687d929f86

SHA256
37202bff2f4f2bf175036758b0f31ddc52de619ee0590a3fb93d3d70ee8a68ec

SHA512
574c437b6b92f30ad06a025ac138f2ab07701438f30906fceaff6bb560d5a7bff7589f01d60af2b17c56c9c114003775b4dfa1cca064ed3aa1e344767eadbe3b

Download Submit
memory/624-1-0x000000000046F000-0x0000000000479000-memory.dmp

Filesize
40KB

Download
memory/624-3-0x0000000000400000-0x00000000004AC000-memory.dmp

Filesize
688KB

Download
memory/624-0-0x0000000002460000-0x0000000002461000-memory.dmp

Filesize
4KB

Download
memory/2576-2-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2576-6-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2576-7-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2576-13-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/3916-18-0x0000000000400000-0x00000000004AC000-memory.dmp

Filesize
688KB

Download
memory/3916-19-0x0000000000400000-0x00000000004AC000-memory.dmp

Filesize
688KB

Download
memory/4928-24-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-28-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-30-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-31-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-33-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-36-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-38-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-41-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4928-44-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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