remcos | e8ff8905d6dcc0e14e29273bd4b72a8ce69f619b7133a77c06a099ead63b9bed

General

Target

try.exe
Size

469KB
MD5

99c634f9a25f880932e835630ccfbe36
SHA1

379ee54b3ba9550fbfa4fb6dad46d58aab220ef0
SHA256

e8ff8905d6dcc0e14e29273bd4b72a8ce69f619b7133a77c06a099ead63b9bed
SHA512

5caf7bdf199abae801db48da37fe3b8285daf0584f2f7f1152e80c33114bfc0dc33dedcf9ede02c86475d8cddd0630eab4e6ca1ff86c4a012d9d11c8e8757231
SSDEEP

12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSin9:uiLJbpI7I2WhQqZ7i9

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

camera-ms.gl.at.ply.gg:50534

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
system.exe
copy_folder
Remcos
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-AIWVTK
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

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	try.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
3260	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
1684	system.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\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	try.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	try.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	system.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	system.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Remcos\system.exe	try.exe
File opened for modification	C:\Windows\SysWOW64\Remcos\system.exe	try.exe
File opened for modification	C:\Windows\SysWOW64\Remcos	try.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1684 set thread context of 2468	1684	system.exe	95

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 8 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.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	system.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	try.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	try.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
956	reg.exe
4204	reg.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1684	system.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2312 wrote to memory of 1364	2312	try.exe	83
PID 2312 wrote to memory of 1364	2312	try.exe	83
PID 2312 wrote to memory of 1364	2312	try.exe	83
PID 1364 wrote to memory of 956	1364	cmd.exe	85
PID 1364 wrote to memory of 956	1364	cmd.exe	85
PID 1364 wrote to memory of 956	1364	cmd.exe	85
PID 2312 wrote to memory of 3260	2312	try.exe	88
PID 2312 wrote to memory of 3260	2312	try.exe	88
PID 2312 wrote to memory of 3260	2312	try.exe	88
PID 3260 wrote to memory of 3456	3260	WScript.exe	91
PID 3260 wrote to memory of 3456	3260	WScript.exe	91
PID 3260 wrote to memory of 3456	3260	WScript.exe	91
PID 3456 wrote to memory of 1684	3456	cmd.exe	93
PID 3456 wrote to memory of 1684	3456	cmd.exe	93
PID 3456 wrote to memory of 1684	3456	cmd.exe	93
PID 1684 wrote to memory of 4764	1684	system.exe	94
PID 1684 wrote to memory of 4764	1684	system.exe	94
PID 1684 wrote to memory of 4764	1684	system.exe	94
PID 1684 wrote to memory of 2468	1684	system.exe	95
PID 1684 wrote to memory of 2468	1684	system.exe	95
PID 1684 wrote to memory of 2468	1684	system.exe	95
PID 1684 wrote to memory of 2468	1684	system.exe	95
PID 4764 wrote to memory of 4204	4764	cmd.exe	97
PID 4764 wrote to memory of 4204	4764	cmd.exe	97
PID 4764 wrote to memory of 4204	4764	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\try.exe
"C:\Users\Admin\AppData\Local\Temp\try.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2312
- C:\Windows\SysWOW64\cmd.exe
  /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1364
- - C:\Windows\SysWOW64\reg.exe
    C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
    3⤵
    - UAC bypass
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:956
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3260
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\Remcos\system.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3456
  - - C:\Windows\SysWOW64\Remcos\system.exe
      C:\Windows\SysWOW64\Remcos\system.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:1684
    - - C:\Windows\SysWOW64\cmd.exe
        
        /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:4764
      - C:\Windows\SysWOW64\reg.exe
        
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        6⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:4204
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        
        PID:2468

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

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

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:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
514B

MD5
96cfc7fce77c59769326c7abb06daf04

SHA1
3134e06e592fc3edff369acb84fdf9dd433ecee8

SHA256
d229a4a8f7b1e65cad351f8fe36e5efc9e445cf149d358375c6eeb35055002eb

SHA512
d796f6f475b790800156a891617f81caa272f834ae982250a5702d1ac093f35e32b27ec5a3b5078f18e8baa7e3605be5e42d7a8182d56032644bf5630843ee6b

Download Submit
C:\Windows\SysWOW64\Remcos\system.exe

Filesize
469KB

MD5
99c634f9a25f880932e835630ccfbe36

SHA1
379ee54b3ba9550fbfa4fb6dad46d58aab220ef0

SHA256
e8ff8905d6dcc0e14e29273bd4b72a8ce69f619b7133a77c06a099ead63b9bed

SHA512
5caf7bdf199abae801db48da37fe3b8285daf0584f2f7f1152e80c33114bfc0dc33dedcf9ede02c86475d8cddd0630eab4e6ca1ff86c4a012d9d11c8e8757231

Download Submit
memory/2468-9-0x0000000000550000-0x00000000005CF000-memory.dmp

Filesize
508KB

Download
memory/2468-10-0x0000000000550000-0x00000000005CF000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads