remcos | 88014ff5f5703337988e52ccc07ba842637c6db0d75ee56a122bf2da1f5e65a3

Analysis

max time kernel
149s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
02/03/2024, 17:22

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General

Target
PC-101-105.exe
Size 54KB
Sample240302-vxsqcsfg96
SHA256 88014ff5f5703337988e52ccc07ba842637c6db0d75ee56a122bf2da1f5e65a3
MD5 4341275bda92b0440a785b1a89294309
SHA1 faf5cf347da4ab2d370fae77fc5ecc8311b4a069
SHA512 9aac8166a106703db52b57ffb8cc23c14b97288b8b47eb599e45fff7792beae18143b20614a7d279ab92471d3bde7e92ac5060359b9e8a46608e297dc6549030
SSDEEP 1536:Y9D4MdUbguHO3aRFPMOtv8bJfpI0f28knei4:Y9EMdUbnuQFUaopId8keL
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos 983733 discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

983733

windowslvlssfebupdate.duckdns.org:4241

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
87363-Q6VFRV
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
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
Contacts a large (4121) amount of remote hosts 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046

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-1-5-21-513485977-2495024337-1260977654-1000\Control Panel\International\Geo\Nation	PC-101-105.exe

Executes dropped EXE 1 IoCs

pid	Process
5220	svchost.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-513485977-2495024337-1260977654-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\""	PC-101-105.exe

Creates a large amount of network flows 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5220 set thread context of 3576	5220	svchost.exe	103

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
664	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4420	timeout.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe
1408	PC-101-105.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1408	PC-101-105.exe
Token: SeDebugPrivilege	5220	svchost.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 1408 wrote to memory of 2268	1408	PC-101-105.exe	96
PID 1408 wrote to memory of 2268	1408	PC-101-105.exe	96
PID 1408 wrote to memory of 976	1408	PC-101-105.exe	98
PID 1408 wrote to memory of 976	1408	PC-101-105.exe	98
PID 976 wrote to memory of 4420	976	cmd.exe	101
PID 976 wrote to memory of 4420	976	cmd.exe	101
PID 2268 wrote to memory of 664	2268	cmd.exe	100
PID 2268 wrote to memory of 664	2268	cmd.exe	100
PID 976 wrote to memory of 5220	976	cmd.exe	102
PID 976 wrote to memory of 5220	976	cmd.exe	102
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 3576	5220	svchost.exe	103
PID 5220 wrote to memory of 5056	5220	svchost.exe	104
PID 5220 wrote to memory of 5056	5220	svchost.exe	104
PID 5220 wrote to memory of 5056	5220	svchost.exe	104

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\PC-101-105.exe
"C:\Users\Admin\AppData\Local\Temp\PC-101-105.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1408
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2268
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:664
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp69C1.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:976
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4420
- - C:\Users\Admin\AppData\Roaming\svchost.exe
    "C:\Users\Admin\AppData\Roaming\svchost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:5220
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
      4⤵
      PID:3576
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
      4⤵
      PID:5056

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Network Service Discovery

T1046

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp69C1.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp69C1.tmp.bat
Size 151B
SHA256 18ca4e58193b5c2ecf94eaddf4822631b26245ea86a18f457868eb137fc7b67d
MD5 c1e67255097f22cc6920ae97b6319b12
SHA1 a2c3b1a3427b1cf809c6f3aed3786c65a1967172
SHA512 81142b1734a421732ff26a64adfa583db3d88c900ee03534d6967319fac030feb53bd04573a95951bd38c91b1860086c2589336d75c4cb1efac63d160db8257a
MD5 SHA1 SHA512

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svchost.exe

Path C:\Users\Admin\AppData\Roaming\svchost.exe
Size 54KB
SHA256 88014ff5f5703337988e52ccc07ba842637c6db0d75ee56a122bf2da1f5e65a3
MD5 4341275bda92b0440a785b1a89294309
SHA1 faf5cf347da4ab2d370fae77fc5ecc8311b4a069
SHA512 9aac8166a106703db52b57ffb8cc23c14b97288b8b47eb599e45fff7792beae18143b20614a7d279ab92471d3bde7e92ac5060359b9e8a46608e297dc6549030
SSDEEP 1536:Y9D4MdUbguHO3aRFPMOtv8bJfpI0f28knei4:Y9EMdUbnuQFUaopId8keL
MD5 SHA1 SHA512 SSDEEP

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memory/1408-0-0x000001C92DE40000-0x000001C92DE50000-memory.dmp

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memory/1408-1-0x00007FFE2CA30000-0x00007FFE2D4F1000-memory.dmp

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memory/1408-2-0x00007FFE2CA30000-0x00007FFE2D4F1000-memory.dmp

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memory/1408-3-0x000001C94A140000-0x000001C94A210000-memory.dmp

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memory/1408-8-0x00007FFE2CA30000-0x00007FFE2D4F1000-memory.dmp

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memory/3576-16-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-14-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-15-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-17-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-19-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-20-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-21-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-22-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-25-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-26-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/3576-27-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/5220-13-0x00007FFE2CB00000-0x00007FFE2D5C1000-memory.dmp

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memory/5220-18-0x00007FFE2CB00000-0x00007FFE2D5C1000-memory.dmp

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