remcos | 0d6e873aa8faee0a896e6ac7679a216585933bc29bdd2c1bc006ce56a6e86818

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
03-03-2024 01:13

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General

Target

RAT/Remcos.exe
Size

92KB
MD5

fb598b93c04baafe98683dc210e779c9
SHA1

c7ccd43a721a508b807c9bf6d774344df58e752f
SHA256

c851749fd6c9fa19293d8ee2c5b45b3dc8561115ddfe7166fbaefcb9b353b7c4
SHA512

1185ffe7e296eaaae50b7bd63baa6ffb8f5e76d4a897cb3800cead507a67c4e5075e677abdbf9831f3f81d01bdf1c06675a7c21985ef20a4bae5a256fd41cc0f
SSDEEP

1536:AhhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6brM:GhzYTGWVvJ8f2v1TbPzuMsIFSHNThy+7

Score

10^/10

remcos host evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

nickman12-46565.portmap.io:46565

nickman12-46565.portmap.io:1735

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
Userdata.exe
copy_folder
Userdata
delete_file
true
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%WinDir%\System32
mouse_option
false
mutex
remcos_vcexssuhap
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

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 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-1-5-21-275798769-4264537674-1142822080-1000\Control Panel\International\Geo\Nation	Remcos.exe

Executes dropped EXE 1 IoCs

pid	Process
3160	Userdata.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-1-5-21-275798769-4264537674-1142822080-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\Userdata\\Userdata.exe\""	Userdata.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\Userdata\\Userdata.exe\""	Remcos.exe

Drops file in System32 directory 3 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3160 set thread context of 3928	3160	Userdata.exe	100

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

System Information Discovery
T1082

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
3520	reg.exe
1540	reg.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
5100	PING.EXE

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1360 wrote to memory of 2076	1360	Remcos.exe	88
PID 1360 wrote to memory of 2076	1360	Remcos.exe	88
PID 1360 wrote to memory of 2076	1360	Remcos.exe	88
PID 2076 wrote to memory of 3520	2076	cmd.exe	90
PID 2076 wrote to memory of 3520	2076	cmd.exe	90
PID 2076 wrote to memory of 3520	2076	cmd.exe	90
PID 1360 wrote to memory of 1604	1360	Remcos.exe	92
PID 1360 wrote to memory of 1604	1360	Remcos.exe	92
PID 1360 wrote to memory of 1604	1360	Remcos.exe	92
PID 1604 wrote to memory of 5100	1604	cmd.exe	94
PID 1604 wrote to memory of 5100	1604	cmd.exe	94
PID 1604 wrote to memory of 5100	1604	cmd.exe	94
PID 1604 wrote to memory of 3160	1604	cmd.exe	97
PID 1604 wrote to memory of 3160	1604	cmd.exe	97
PID 1604 wrote to memory of 3160	1604	cmd.exe	97
PID 3160 wrote to memory of 3980	3160	Userdata.exe	98
PID 3160 wrote to memory of 3980	3160	Userdata.exe	98
PID 3160 wrote to memory of 3980	3160	Userdata.exe	98
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3160 wrote to memory of 3928	3160	Userdata.exe	100
PID 3980 wrote to memory of 1540	3980	cmd.exe	101
PID 3980 wrote to memory of 1540	3980	cmd.exe	101
PID 3980 wrote to memory of 1540	3980	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\RAT\Remcos.exe
"C:\Users\Admin\AppData\Local\Temp\RAT\Remcos.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1360
- 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⤵
  - Suspicious use of WriteProcessMemory
  PID:2076
- - 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
    - Modifies registry key
    PID:3520
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1604
- - C:\Windows\SysWOW64\PING.EXE
    PING 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:5100
- - C:\Windows\SysWOW64\Userdata\Userdata.exe
    "C:\Windows\SysWOW64\Userdata\Userdata.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3160
  - - 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
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3980
    - - 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
        5⤵
        UAC bypass
        Modifies registry key
        
        PID:1540
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
      4⤵
      PID:3928

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

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
148B

MD5
43bb14202009886c1eef88edffd2d3ef

SHA1
02a9ef66f2a585c6f2f7b86042a5aa211be824c9

SHA256
da483866490b19391640699ec0e0bd2fe4a78b94879eb99cdc7dafc80bce6b62

SHA512
c93ea027189e96741e1f43c4bdd1c60c11115f67eddea54417a6c0e1252a689311d7d951d3c2e5ba803ecc842da435587413091fc1cf7396951a22a92db2ea83

Download Submit
C:\Windows\SysWOW64\Userdata\Userdata.exe

Filesize
92KB

MD5
fb598b93c04baafe98683dc210e779c9

SHA1
c7ccd43a721a508b807c9bf6d774344df58e752f

SHA256
c851749fd6c9fa19293d8ee2c5b45b3dc8561115ddfe7166fbaefcb9b353b7c4

SHA512
1185ffe7e296eaaae50b7bd63baa6ffb8f5e76d4a897cb3800cead507a67c4e5075e677abdbf9831f3f81d01bdf1c06675a7c21985ef20a4bae5a256fd41cc0f

Download Submit
memory/3928-9-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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