remcos | 1136869b303bfb491fda58869c898c19d9086fe34fd752018e49804481c6fbb1

Resubmissions

12/01/2023, 05:26

230112-f46hgafc3910

11/01/2023, 08:41

230111-klez1sfe5v10

Analysis

max time kernel
150s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
11/01/2023, 08:41

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General

Target
KKKKLLLZ.exe
Size 1.0MB
Sample230111-klez1sfe5v
SHA256 1136869b303bfb491fda58869c898c19d9086fe34fd752018e49804481c6fbb1
MD5 8b2c765f32817f01f85bd40beed1f4d9
SHA1 10f0f92737e9c321a0ea58d0353dac753c3622df
SHA512 ffeb77ed0366fa25d3e959c5d6701aa42ef159235b41cf6a680d5aef92396a9ebed62134aeb79c8efc299821c04e5006e1e127885e32a1f5e128790653e4200a
SSDEEP 24576:tlykxJZPtBKbgrvlAU3XW0iu7/R+N+U5qpS7xuy3UObnn:twKPXfzl3/sN+Wqp7yEOTn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos kelzy persistence rat

Malware Config

Extracted

Family

remcos

Version

3.1.5 Pro

Botnet

KELZY

217.64.127.195:52651
127.0.0.1:52651
10.5.247.128:52651

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-0P85WR
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
take_screenshot_title
notepad;solitaire;

Signatures

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

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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	KKKKLLLZ.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Isoczsiogu = "\"C:\\Users\\Admin\\AppData\\Roaming\\Wvshspnfgxa\\Isoczsiogu.exe\""	KKKKLLLZ.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2384 set thread context of 4636	2384	KKKKLLLZ.exe	91

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4912	powershell.exe
4912	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4912	powershell.exe
Token: SeDebugPrivilege	2384	KKKKLLLZ.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 4912	2384	KKKKLLLZ.exe	83
PID 2384 wrote to memory of 4912	2384	KKKKLLLZ.exe	83
PID 2384 wrote to memory of 4912	2384	KKKKLLLZ.exe	83
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91
PID 2384 wrote to memory of 4636	2384	KKKKLLLZ.exe	91

C:\Users\Admin\AppData\Local\Temp\KKKKLLLZ.exe
"C:\Users\Admin\AppData\Local\Temp\KKKKLLLZ.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2384
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMQAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4912
- C:\Users\Admin\AppData\Local\Temp\KKKKLLLZ.exe
  C:\Users\Admin\AppData\Local\Temp\KKKKLLLZ.exe
  2⤵
  PID:4636

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2384-136-0x0000000005530000-0x0000000005AD4000-memory.dmp

Download

memory/2384-137-0x0000000004ED0000-0x0000000004F62000-memory.dmp

Download

memory/2384-138-0x0000000004FA0000-0x0000000004FAA000-memory.dmp

Download

memory/2384-139-0x00000000078D0000-0x00000000078F2000-memory.dmp

Download

memory/2384-135-0x0000000000430000-0x000000000053C000-memory.dmp

Download

memory/4636-153-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/4636-152-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/4636-151-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/4636-150-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/4636-149-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/4912-143-0x00000000059D0000-0x0000000005A36000-memory.dmp

Download

memory/4912-147-0x0000000006E00000-0x0000000006E1A000-memory.dmp

Download

memory/4912-146-0x0000000008140000-0x00000000087BA000-memory.dmp

Download

memory/4912-145-0x0000000006900000-0x000000000691E000-memory.dmp

Download

memory/4912-144-0x00000000062A0000-0x0000000006306000-memory.dmp

Download

memory/4912-142-0x0000000005B40000-0x0000000006168000-memory.dmp

Download

memory/4912-141-0x00000000053A0000-0x00000000053D6000-memory.dmp

Download