remcos | 23a8ef813c54db77e7d1e7b56b43211dea27b3f63bd47318616c1d62f946334e

Analysis

max time kernel
119s
max time network
122s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
10/06/2024, 00:44

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General

Target
Server.exe
Size 469KB
Sample240610-a3hgcsab67
SHA256 23a8ef813c54db77e7d1e7b56b43211dea27b3f63bd47318616c1d62f946334e
MD5 bd94649269e70da15b1bbc6d8c42cbf0
SHA1 2ed8a385eccb9f9d82cf85a3c5bfab64a75cf68a
SHA512 97597d9c8252cd6b2ce17939e1e80d75e5148502d0d814dd3cc8a0daa765b3b0f8d16e770d5d7a1a57d512fbc5bb4f5e6f375b7fef8b872c6490979bcd70bfdd
SSDEEP 12288:Imnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSJn9:4iLJbpI7I2WhQqZ7J9
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos hosting collection persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Hosting

az-evolution.gl.at.ply.gg:17672

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
wd defender.exe
copy_folder
WD
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%SystemDrive%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-PMKG1L
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
WD Defender
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1048-34-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/5032-32-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/1048-34-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/5032-32-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3624-31-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft

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-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation	Server.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
1604	wd defender.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	iexplore.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-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WD Defender = "\"C:\\WD\\wd defender.exe\""	Server.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WD Defender = "\"C:\\WD\\wd defender.exe\""	Server.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WD Defender = "\"C:\\WD\\wd defender.exe\""	wd defender.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WD Defender = "\"C:\\WD\\wd defender.exe\""	wd defender.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 1604 set thread context of 1164	1604	wd defender.exe	85
PID 1164 set thread context of 4800	1164	iexplore.exe	86
PID 1164 set thread context of 5032	1164	iexplore.exe	92
PID 1164 set thread context of 1048	1164	iexplore.exe	95
PID 1164 set thread context of 3624	1164	iexplore.exe	96

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000_Classes\Local Settings	Server.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5032	iexplore.exe
5032	iexplore.exe
3624	iexplore.exe
3624	iexplore.exe
5032	iexplore.exe
5032	iexplore.exe

Suspicious behavior: MapViewOfSection 8 IoCs

pid	Process
1604	wd defender.exe
1164	iexplore.exe
1164	iexplore.exe
1164	iexplore.exe
1164	iexplore.exe
1164	iexplore.exe
1164	iexplore.exe
1164	iexplore.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3624	iexplore.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 4740 wrote to memory of 3736	4740	Server.exe	81
PID 4740 wrote to memory of 3736	4740	Server.exe	81
PID 4740 wrote to memory of 3736	4740	Server.exe	81
PID 3736 wrote to memory of 3108	3736	WScript.exe	82
PID 3736 wrote to memory of 3108	3736	WScript.exe	82
PID 3736 wrote to memory of 3108	3736	WScript.exe	82
PID 3108 wrote to memory of 1604	3108	cmd.exe	84
PID 3108 wrote to memory of 1604	3108	cmd.exe	84
PID 3108 wrote to memory of 1604	3108	cmd.exe	84
PID 1604 wrote to memory of 1164	1604	wd defender.exe	85
PID 1604 wrote to memory of 1164	1604	wd defender.exe	85
PID 1604 wrote to memory of 1164	1604	wd defender.exe	85
PID 1604 wrote to memory of 1164	1604	wd defender.exe	85
PID 1164 wrote to memory of 4800	1164	iexplore.exe	86
PID 1164 wrote to memory of 4800	1164	iexplore.exe	86
PID 1164 wrote to memory of 4800	1164	iexplore.exe	86
PID 1164 wrote to memory of 4800	1164	iexplore.exe	86
PID 1164 wrote to memory of 3840	1164	iexplore.exe	91
PID 1164 wrote to memory of 3840	1164	iexplore.exe	91
PID 1164 wrote to memory of 3840	1164	iexplore.exe	91
PID 1164 wrote to memory of 5032	1164	iexplore.exe	92
PID 1164 wrote to memory of 5032	1164	iexplore.exe	92
PID 1164 wrote to memory of 5032	1164	iexplore.exe	92
PID 1164 wrote to memory of 5032	1164	iexplore.exe	92
PID 1164 wrote to memory of 908	1164	iexplore.exe	93
PID 1164 wrote to memory of 908	1164	iexplore.exe	93
PID 1164 wrote to memory of 908	1164	iexplore.exe	93
PID 1164 wrote to memory of 4488	1164	iexplore.exe	94
PID 1164 wrote to memory of 4488	1164	iexplore.exe	94
PID 1164 wrote to memory of 4488	1164	iexplore.exe	94
PID 1164 wrote to memory of 1048	1164	iexplore.exe	95
PID 1164 wrote to memory of 1048	1164	iexplore.exe	95
PID 1164 wrote to memory of 1048	1164	iexplore.exe	95
PID 1164 wrote to memory of 1048	1164	iexplore.exe	95
PID 1164 wrote to memory of 3624	1164	iexplore.exe	96
PID 1164 wrote to memory of 3624	1164	iexplore.exe	96
PID 1164 wrote to memory of 3624	1164	iexplore.exe	96
PID 1164 wrote to memory of 3624	1164	iexplore.exe	96

C:\Users\Admin\AppData\Local\Temp\Server.exe
"C:\Users\Admin\AppData\Local\Temp\Server.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4740
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:3736
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\WD\wd defender.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3108
  - - C:\WD\wd defender.exe
      "C:\WD\wd defender.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:1604
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        Suspicious use of SetThreadContext
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:1164
      - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        6⤵
        
        PID:4800
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe" /stext "C:\Users\Admin\AppData\Local\Temp\czeprholydbglkpddwfrowhvltfvuknqww"
        6⤵
        
        PID:3840
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe" /stext "C:\Users\Admin\AppData\Local\Temp\czeprholydbglkpddwfrowhvltfvuknqww"
        6⤵
        Suspicious behavior: EnumeratesProcesses
        
        PID:5032
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe" /stext "C:\Users\Admin\AppData\Local\Temp\ntjarrz"
        6⤵
        
        PID:908
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe" /stext "C:\Users\Admin\AppData\Local\Temp\ntjarrz"
        6⤵
        
        PID:4488
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe" /stext "C:\Users\Admin\AppData\Local\Temp\ntjarrz"
        6⤵
        Accesses Microsoft Outlook accounts
        
        PID:1048
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe" /stext "C:\Users\Admin\AppData\Local\Temp\pnptsjjhau"
        6⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3624

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

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

czeprholydbglkpddwfrowhvltfvuknqww

Path C:\Users\Admin\AppData\Local\Temp\czeprholydbglkpddwfrowhvltfvuknqww
Size 4KB
SHA256 eef6222f63aae44aec7addd2cdf1d348af92b32e0be1d4c857c48d9a941d9dac
MD5 0c71400795defb1ddf2816dcb2440470
SHA1 a9f25ddc014a44b58a890ac42ea47d98a3f754a3
SHA512 4d5fd766afe850d8282b85ca0ff3ef36e225e754254f43e1e3e0147675d40f901096199e666310e7f70b6cfbe9f33f3dbe4a063fbd4df7267190bad5121efabf
SSDEEP 48:wvvv0HxfvvcHxfdvv0HxBvv0Hxakvv0H7:mvyxvKp1vyPvybvy7
MD5 SHA1 SHA512 SSDEEP

Submit Download

install.vbs

Path C:\Users\Admin\AppData\Local\Temp\install.vbs
Size 364B
SHA256 b83c91bc7e5adee8745d1ede097e66683530d9bb863c74e5d6c7fdca3e6e8f2d
MD5 fc895209fc57a60569d9689a27138b03
SHA1 14a4e64dc82dfc36cab1968da1bb1911398a05df
SHA512 d3bb2b657da81196f91483da0ec236fba22a5883b103693b4516bf629b0d76aed20b6b4444500382223b9cae12288da956f9379541770c7bd8e37201501c0fe2
MD5 SHA1 SHA512

Submit Download

wd defender.exe

Path C:\WD\wd defender.exe
Size 469KB
SHA256 23a8ef813c54db77e7d1e7b56b43211dea27b3f63bd47318616c1d62f946334e
MD5 bd94649269e70da15b1bbc6d8c42cbf0
SHA1 2ed8a385eccb9f9d82cf85a3c5bfab64a75cf68a
SHA512 97597d9c8252cd6b2ce17939e1e80d75e5148502d0d814dd3cc8a0daa765b3b0f8d16e770d5d7a1a57d512fbc5bb4f5e6f375b7fef8b872c6490979bcd70bfdd
SSDEEP 12288:Imnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSJn9:4iLJbpI7I2WhQqZ7J9
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1048-33-0x0000000000400000-0x0000000000457000-memory.dmp

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memory/1048-34-0x0000000000400000-0x0000000000457000-memory.dmp

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memory/1048-27-0x0000000000400000-0x0000000000457000-memory.dmp

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memory/1164-45-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-46-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-9-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-12-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-19-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-18-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-21-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-20-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-23-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-17-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-58-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-16-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-53-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-57-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-54-0x0000000010000000-0x000000001005F000-memory.dmp

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memory/1164-52-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-50-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-49-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-48-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-40-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-41-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-43-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-42-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-44-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-10-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-11-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/1164-47-0x0000000000720000-0x000000000079F000-memory.dmp

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memory/3624-30-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/3624-29-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/3624-31-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/4800-14-0x00000000012C0000-0x000000000133F000-memory.dmp

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memory/4800-15-0x00000000012C0000-0x000000000133F000-memory.dmp

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memory/5032-26-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/5032-28-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/5032-32-0x0000000000400000-0x0000000000478000-memory.dmp

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