remcos | d3a05e751d5ca908573dcccbd992a38fdb0409f25924bd84b116d93b1dd2b644

General

Target

rezzes.exe
Size

469KB
MD5

f92265d27975f6674601d45200d2de25
SHA1

23cc2c0df450d4425dde1f663af5d8c810a32dd3
SHA256

d3a05e751d5ca908573dcccbd992a38fdb0409f25924bd84b116d93b1dd2b644
SHA512

1b92b67e81f323e8343484cfc3fd21462b4ce25b903d0ed52e1068670ab15d9c739a03a25260f75b33b65b5a527d64b2f46bc9edcabbd98e4e7ad32fe738e22a
SSDEEP

12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSPn9:uiLJbpI7I2WhQqZ7P9

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

204.10.194.175:4444

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
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-V5PKB7
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
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
Remcos family
remcos

Checks computer location settings 2 TTPs 2 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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	rezzes.exe

Executes dropped EXE 1 IoCs

pid	Process
3940	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	rezzes.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	rezzes.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3940 set thread context of 1744	3940	remcos.exe	87

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 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	rezzes.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000_Classes\Local Settings	rezzes.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3940	remcos.exe
3940	remcos.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3940	remcos.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 856 wrote to memory of 3260	856	rezzes.exe	83
PID 856 wrote to memory of 3260	856	rezzes.exe	83
PID 856 wrote to memory of 3260	856	rezzes.exe	83
PID 3260 wrote to memory of 3096	3260	WScript.exe	84
PID 3260 wrote to memory of 3096	3260	WScript.exe	84
PID 3260 wrote to memory of 3096	3260	WScript.exe	84
PID 3096 wrote to memory of 3940	3096	cmd.exe	86
PID 3096 wrote to memory of 3940	3096	cmd.exe	86
PID 3096 wrote to memory of 3940	3096	cmd.exe	86
PID 3940 wrote to memory of 1744	3940	remcos.exe	87
PID 3940 wrote to memory of 1744	3940	remcos.exe	87
PID 3940 wrote to memory of 1744	3940	remcos.exe	87
PID 3940 wrote to memory of 1744	3940	remcos.exe	87

C:\Users\Admin\AppData\Local\Temp\rezzes.exe
"C:\Users\Admin\AppData\Local\Temp\rezzes.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:856
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3260
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Remcos\remcos.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3096
  - - C:\ProgramData\Remcos\remcos.exe
      C:\ProgramData\Remcos\remcos.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:3940
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        
        PID:1744

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

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Remcos\remcos.exe

Filesize
469KB

MD5
f92265d27975f6674601d45200d2de25

SHA1
23cc2c0df450d4425dde1f663af5d8c810a32dd3

SHA256
d3a05e751d5ca908573dcccbd992a38fdb0409f25924bd84b116d93b1dd2b644

SHA512
1b92b67e81f323e8343484cfc3fd21462b4ce25b903d0ed52e1068670ab15d9c739a03a25260f75b33b65b5a527d64b2f46bc9edcabbd98e4e7ad32fe738e22a

Download Submit
C:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
386B

MD5
1ec6289c6fd4c2ded6b2836ed28cbeb5

SHA1
c4e08195e6c640eb8860acc03fda1d649b4fe070

SHA256
6efdc40f9eb217f879607614e928b65bff759e424f3efb31faceb2a043c32dc2

SHA512
20bc46f4dee22f75f15c402c7c2eaee60fff7dd92548050585571dcbefd59485cc249c06bc3f1aac7a138e5ae67c0c3918b46ffa24c8b0f1b092e2f6b6e21288

Download Submit
memory/1744-8-0x0000000000950000-0x00000000009CF000-memory.dmp

Filesize
508KB

Download
memory/1744-9-0x0000000000950000-0x00000000009CF000-memory.dmp

Filesize
508KB

Download
memory/1744-11-0x0000000000950000-0x00000000009CF000-memory.dmp

Filesize
508KB

Download
memory/1744-10-0x0000000000950000-0x00000000009CF000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads