cleanuploader | 4001ca434aef1efa8738bcdce056820150a9abc45e8ce3690d9cfc2188e96f0e

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
24/05/2026, 01:50

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General

Target
sub_4001ca434aef.dll
Size 1.5MB
Sample260524-b9frsaew9q
SHA256 4001ca434aef1efa8738bcdce056820150a9abc45e8ce3690d9cfc2188e96f0e
MD5 fb04518bbd936b17da317673442c6d41
SHA1 495477fa62f592b4afbdd07611b0a8d37113ad45
SHA512 8f8f8ea7e4876c8bbd2e6128f77479420b3c9d28b1250d4fb32ac5d986027e20699d9c5fe10a33d483f41ba57253f3e13f2a0779f499a0cf43df7ec5ceef0687
SSDEEP 24576:72mj42MEVQPFEorkSYuX/7DkbSrh/qtoT/cghZlYPL9t7B6oTubWbfws8Sn:fjnMEVQ9FkSLvkurNqtoTkgjcD7B6MuQ
TLSH
T16C65CF11B982C432E99E02B0653CE77B147D7A320B6244E7EBC82ABD6C741E35739797
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery cleanuploader trojan

Malware Config

Extracted

Family

cleanuploader

https://yourserenahelpcustom.uk/
https://retdirectyourman.eu/
https://supfoundrysettlers.us/
http://149.248.79.62/
http://206.166.251.114/
http://64.95.10.243/

Attributes

c2_uris
api/connect

api/session
dll_version
v2.0.1 #File11

Signatures

Family: CleanUpLoader, Oyster, OysterLoader
CleanUpLoader aka Oyster is a remote access trojan written in C++, first observed in July 2023.
trojan cleanuploader

Program crash 1 IoCs

pid	pid_target	Process	procid_target
760	1052	WerFault.exe	88

System Location Discovery: System Language Discovery 1 TTPs 1 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	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1052	rundll32.exe
1052	rundll32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 1992 wrote to memory of 1052	1992	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\sub_4001ca434aef.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1992
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\sub_4001ca434aef.dll,#1
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:1052
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1052 -s 648
    3⤵
    - Program crash
    PID:760

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1052 -ip 1052
1⤵
PID:464

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

memory/1052-0-0x0000000002BD0000-0x0000000002C49000-memory.dmp

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