remcos | a0911f69ebcbc93540e63bf007fcab0bbece1a9f55c780ea29fc0a4935e2b93b

Analysis

max time kernel
148s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
10/08/2022, 19:52

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General

Target
rrXcTwCT.exe
Size 124KB
Sample220810-yldnvaecdj
SHA256 a0911f69ebcbc93540e63bf007fcab0bbece1a9f55c780ea29fc0a4935e2b93b
MD5 909b5860cad8562a6908b2e043e89da8
SHA1 f35faaa0884f2124d15172e22e889f306a6ab4dc
SHA512 f970df92edb62fe0b7a3d5fe7f540f217b19f00b5e3192aa58acac86f718bacb8966aba2a8db8d8ee17f7c44fa0d1b8d14e32273c26d8f0d172c71b1843200a8
MD5 SHA1 SHA512

Score

10^/10

remcos remotehost evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

2.5.1 Pro

Botnet

RemoteHost

67.211.213.207:444

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
srchost.exe
copy_folder
srchost
delete_file
true
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
srchost
keylog_path
%AppData%
mouse_option
false
mutex
srchost-93R9LI
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
srchost
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

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

UAC bypass 3 TTPs 3 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

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

Executes dropped EXE 1 IoCs

pid	Process
1276	srchost.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-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	rrXcTwCT.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	srchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\srchost = "\"C:\\Windows\\SysWOW64\\srchost\\srchost.exe\""	srchost.exe
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\srchost = "\"C:\\Windows\\SysWOW64\\srchost\\srchost.exe\""	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	rrXcTwCT.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\srchost = "\"C:\\Windows\\SysWOW64\\srchost\\srchost.exe\""	rrXcTwCT.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\srchost\srchost.exe	rrXcTwCT.exe
File opened for modification	C:\Windows\SysWOW64\srchost	rrXcTwCT.exe
File created	C:\Windows\SysWOW64\srchost\srchost.exe	rrXcTwCT.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1276 set thread context of 1072	1276	srchost.exe	83
PID 1072 set thread context of 8	1072	iexplore.exe	87

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000_Classes\Local Settings	rrXcTwCT.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
3144	reg.exe
1396	reg.exe
3124	reg.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1072	iexplore.exe

Suspicious use of WriteProcessMemory 47 IoCs

description	pid	Process	procid_target
PID 3864 wrote to memory of 3508	3864	rrXcTwCT.exe	75
PID 3864 wrote to memory of 3508	3864	rrXcTwCT.exe	75
PID 3864 wrote to memory of 3508	3864	rrXcTwCT.exe	75
PID 3508 wrote to memory of 3144	3508	cmd.exe	77
PID 3508 wrote to memory of 3144	3508	cmd.exe	77
PID 3508 wrote to memory of 3144	3508	cmd.exe	77
PID 3864 wrote to memory of 3348	3864	rrXcTwCT.exe	78
PID 3864 wrote to memory of 3348	3864	rrXcTwCT.exe	78
PID 3864 wrote to memory of 3348	3864	rrXcTwCT.exe	78
PID 3348 wrote to memory of 1852	3348	WScript.exe	79
PID 3348 wrote to memory of 1852	3348	WScript.exe	79
PID 3348 wrote to memory of 1852	3348	WScript.exe	79
PID 1852 wrote to memory of 1276	1852	cmd.exe	81
PID 1852 wrote to memory of 1276	1852	cmd.exe	81
PID 1852 wrote to memory of 1276	1852	cmd.exe	81
PID 1276 wrote to memory of 3028	1276	srchost.exe	82
PID 1276 wrote to memory of 3028	1276	srchost.exe	82
PID 1276 wrote to memory of 3028	1276	srchost.exe	82
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1276 wrote to memory of 1072	1276	srchost.exe	83
PID 1072 wrote to memory of 1452	1072	iexplore.exe	85
PID 1072 wrote to memory of 1452	1072	iexplore.exe	85
PID 1072 wrote to memory of 1452	1072	iexplore.exe	85
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1072 wrote to memory of 8	1072	iexplore.exe	87
PID 1452 wrote to memory of 3124	1452	cmd.exe	89
PID 1452 wrote to memory of 3124	1452	cmd.exe	89
PID 1452 wrote to memory of 3124	1452	cmd.exe	89
PID 3028 wrote to memory of 1396	3028	cmd.exe	88
PID 3028 wrote to memory of 1396	3028	cmd.exe	88
PID 3028 wrote to memory of 1396	3028	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\rrXcTwCT.exe
"C:\Users\Admin\AppData\Local\Temp\rrXcTwCT.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3864
- 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:3508
- - 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:3144
- 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:3348
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\srchost\srchost.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1852
  - - C:\Windows\SysWOW64\srchost\srchost.exe
      C:\Windows\SysWOW64\srchost\srchost.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:1276
    - - 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⤵
        Suspicious use of WriteProcessMemory
        
        PID:3028
      - 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
        Modifies registry key
        
        PID:1396
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        5⤵
        Adds Run key to start application
        Suspicious use of SetThreadContext
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1072
      - 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
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:1452
        
        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
        7⤵
        UAC bypass
        Modifies registry key
        
        PID:3124
      - C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        6⤵
        
        PID:8

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Bypass User Account Control

T1088

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

install.vbs

Path C:\Users\Admin\AppData\Local\Temp\install.vbs
Size 528B
SHA256 9d53565ca08c8798045335fe6989c291db990cef9599ce1bbd98dab6088754f9
MD5 50d42e4d9d8b8b33212f55ebca244260
SHA1 ee38f9fb5dbce201af89330a1f58c38b54dbe850
SHA512 8bdb7c42b340a11a13de5f846e9ea79387ff9b0730a7616180fe7fafe6cff80deb83f7ebc52c2f5b594fbb0fe39655e9443930368e8b8ace21a3a9b63a6e8fa3
MD5 SHA1 SHA512

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srchost.exe

Path C:\Windows\SysWOW64\srchost\srchost.exe
Size 124KB
SHA256 a0911f69ebcbc93540e63bf007fcab0bbece1a9f55c780ea29fc0a4935e2b93b
MD5 909b5860cad8562a6908b2e043e89da8
SHA1 f35faaa0884f2124d15172e22e889f306a6ab4dc
SHA512 f970df92edb62fe0b7a3d5fe7f540f217b19f00b5e3192aa58acac86f718bacb8966aba2a8db8d8ee17f7c44fa0d1b8d14e32273c26d8f0d172c71b1843200a8
SSDEEP 3072:mpgk9sZwnSD9Pb0CR36oWdHZ8xyicFtsnal5OzqhPL9tn:Cgk9EySD9z0CjeHyxyicFtsnavOzqhPb
MD5 SHA1 SHA512 SSDEEP

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srchost.exe

Path C:\Windows\SysWOW64\srchost\srchost.exe
Size 124KB
SHA256 a0911f69ebcbc93540e63bf007fcab0bbece1a9f55c780ea29fc0a4935e2b93b
MD5 909b5860cad8562a6908b2e043e89da8
SHA1 f35faaa0884f2124d15172e22e889f306a6ab4dc
SHA512 f970df92edb62fe0b7a3d5fe7f540f217b19f00b5e3192aa58acac86f718bacb8966aba2a8db8d8ee17f7c44fa0d1b8d14e32273c26d8f0d172c71b1843200a8
SSDEEP 3072:mpgk9sZwnSD9Pb0CR36oWdHZ8xyicFtsnal5OzqhPL9tn:Cgk9EySD9z0CjeHyxyicFtsnavOzqhPb
MD5 SHA1 SHA512 SSDEEP

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memory/8-141-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/8-146-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/8-143-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads