remcos | 4311ee23e9f4cb3432d3b0a5a78b020f89494063ba1d870298f2117970879e37

Resubmissions

17/08/2024, 15:47

240817-s76nvstcpc

14/08/2024, 15:23

240814-ssramazbkg10

Analysis

max time kernel
143s
max time network
133s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
14/08/2024, 15:23

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General

Target
Updater.exe
Size 483KB
Sample240814-ssramazbkg
SHA256 4311ee23e9f4cb3432d3b0a5a78b020f89494063ba1d870298f2117970879e37
MD5 2e2946dbb102329c2b7ea3a6bc6d928e
SHA1 f71e23604985c52f609a8eaa1f907b6cf1311bbe
SHA512 60ab3f9a07d86dcdf37e2823d2f140f28dcd2b6120821703db1eadd2ed8ab34aea6abeb5cc6e54426374f6e780a2d9014dbd1a9d353cbb1d6ccd077e58ce57da
SSDEEP 6144:QTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZBAXccrbT4:QTlrYw1RUh3NFn+N5WfIQIjbs/ZBIT4
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

mode-clusters.gl.at.ply.gg:36304

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
$77-Installer
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-YXZARA
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

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

Adds policy 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\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\""	iexplore.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	Updater.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\""	Updater.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	iexplore.exe

Deletes itself 1 IoCs

pid	Process
3648	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-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\""	Updater.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\""	Updater.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\""	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\""	iexplore.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Remcos	iexplore.exe
File opened for modification	C:\Windows\SysWOW64\Remcos\$77-Installer	iexplore.exe
File created	C:\Windows\SysWOW64\Remcos\$77-Installer	Updater.exe
File opened for modification	C:\Windows\SysWOW64\Remcos\$77-Installer	Updater.exe
File opened for modification	C:\Windows\SysWOW64\Remcos	Updater.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4372 set thread context of 3648	4372	Updater.exe	94
PID 3648 set thread context of 1844	3648	iexplore.exe	97

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 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	Updater.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	iexplore.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

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000_Classes\Local Settings	iexplore.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
3380	reg.exe
2284	reg.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4372	Updater.exe
4372	Updater.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
4372	Updater.exe
3648	iexplore.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4372 wrote to memory of 980	4372	Updater.exe	91
PID 4372 wrote to memory of 980	4372	Updater.exe	91
PID 4372 wrote to memory of 980	4372	Updater.exe	91
PID 980 wrote to memory of 3380	980	cmd.exe	93
PID 980 wrote to memory of 3380	980	cmd.exe	93
PID 980 wrote to memory of 3380	980	cmd.exe	93
PID 4372 wrote to memory of 3648	4372	Updater.exe	94
PID 4372 wrote to memory of 3648	4372	Updater.exe	94
PID 4372 wrote to memory of 3648	4372	Updater.exe	94
PID 4372 wrote to memory of 3648	4372	Updater.exe	94
PID 3648 wrote to memory of 2752	3648	iexplore.exe	96
PID 3648 wrote to memory of 2752	3648	iexplore.exe	96
PID 3648 wrote to memory of 2752	3648	iexplore.exe	96
PID 3648 wrote to memory of 1844	3648	iexplore.exe	97
PID 3648 wrote to memory of 1844	3648	iexplore.exe	97
PID 3648 wrote to memory of 1844	3648	iexplore.exe	97
PID 3648 wrote to memory of 1844	3648	iexplore.exe	97
PID 2752 wrote to memory of 2284	2752	cmd.exe	99
PID 2752 wrote to memory of 2284	2752	cmd.exe	99
PID 2752 wrote to memory of 2284	2752	cmd.exe	99
PID 3648 wrote to memory of 3112	3648	iexplore.exe	108
PID 3648 wrote to memory of 3112	3648	iexplore.exe	108
PID 3648 wrote to memory of 3112	3648	iexplore.exe	108

C:\Users\Admin\AppData\Local\Temp\Updater.exe
"C:\Users\Admin\AppData\Local\Temp\Updater.exe"
1⤵
- Adds policy Run key to start application
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4372
- 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:980
- - 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:3380
- \??\c:\program files (x86)\internet explorer\iexplore.exe
  "c:\program files (x86)\internet explorer\iexplore.exe"
  2⤵
  - Adds policy Run key to start application
  - Deletes itself
  - Adds Run key to start application
  - Drops file in System32 directory
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3648
- - 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:2752
  - - 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:2284
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    PID:1844
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\gfffpjcjnmjggjqyujryqqonytrtegml.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3112

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4328,i,8548254608087149642,10333768245962368401,262144 --variations-seed-version --mojo-platform-channel-handle=4304 /prefetch:8
1⤵
PID:456

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

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

gfffpjcjnmjggjqyujryqqonytrtegml.vbs

Path C:\Users\Admin\AppData\Local\Temp\gfffpjcjnmjggjqyujryqqonytrtegml.vbs
Size 572B
SHA256 bebb01f3ebac7d6849f08374aa13883c6f657df0729f1ad03a100764688e8f4c
MD5 54a769d74f2b983cb50faaf758561dbe
SHA1 c8f0dd48ebc00ca1fefcba1b904f04d93cab3228
SHA512 2ed0cebda27b59db789fe98104529b43ffcf996926d9860e87c29ef7f73be64a160e24d4595642aa824fee86726f6f05451d1268096608b9ec0352fcde2b5692
MD5 SHA1 SHA512

Submit Download

$77-Installer

Path C:\Windows\SysWOW64\Remcos\$77-Installer
Size 483KB
SHA256 4311ee23e9f4cb3432d3b0a5a78b020f89494063ba1d870298f2117970879e37
MD5 2e2946dbb102329c2b7ea3a6bc6d928e
SHA1 f71e23604985c52f609a8eaa1f907b6cf1311bbe
SHA512 60ab3f9a07d86dcdf37e2823d2f140f28dcd2b6120821703db1eadd2ed8ab34aea6abeb5cc6e54426374f6e780a2d9014dbd1a9d353cbb1d6ccd077e58ce57da
SSDEEP 6144:QTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZBAXccrbT4:QTlrYw1RUh3NFn+N5WfIQIjbs/ZBIT4
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1844-26-0x0000000000980000-0x0000000000A02000-memory.dmp

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memory/1844-23-0x0000000000980000-0x0000000000A02000-memory.dmp

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memory/1844-24-0x0000000000980000-0x0000000000A02000-memory.dmp

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memory/1844-27-0x0000000000980000-0x0000000000A02000-memory.dmp

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memory/3648-29-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-34-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-18-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-15-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-22-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-28-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-25-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-30-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-33-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-16-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-35-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-36-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-37-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-38-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-39-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-40-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-44-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-45-0x0000000000600000-0x0000000000682000-memory.dmp

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memory/3648-17-0x0000000000600000-0x0000000000682000-memory.dmp

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