zloader | 21587aadce40fc29bdf220e3ad7b63e87f9210dcc3742cf77dc7544438b8db32

Analysis

max time kernel
149s
max time network
112s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
22/05/2026, 17:51

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
tmpyyhrv0os.dll
Size 155KB
Sample260522-wfhdqset9y
SHA256 21587aadce40fc29bdf220e3ad7b63e87f9210dcc3742cf77dc7544438b8db32
MD5 bcb6960b9f204fe1a299e44d011964c3
SHA1 9463ef0923c751223a676fd962d90345edf198ac
SHA512 1b075f1ae357e8d1af4a86c687a674a58991e108b2a7c2d45dda9119bc3d1f111c491176e034266efd741f687e203d4ee91d2a13d3f7ad74a06ebb69cd14dae1
SSDEEP 3072:h35KkzBoJJ9DGW4tJ80rV81TSFtIWzepbhfm4OPdvl7h8iCP:edDGpJ8+V8CtIauh+4udkiC
TLSH
T18FF30A511890C134F81104B15D9CA7BEAE56C20D6B238BABDBD4C8A49FD89B0B77F35E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

botnet nut 16/02 discovery zloader trojan

Malware Config

Extracted

Family

zloader

Botnet

Campaign

16/02

https://wewalk.cl/post.php
https://dpack-co.com/post.php
https://dr-mirahmadi.ir/post.php
https://indiaastrologyfoundation.in/post.php
https://metisacademy.ir/post.php
https://lan-samarinda.com/post.php
https://pyouleigorgawimbwans.tk/post.php

Attributes

build_id
351

rc4.plain

rsa_pubkey.plain

Signatures

Family: Zloader, Terdot, DELoader, ZeusSphinx
Zloader is a malware strain that was initially discovered back in August 2015.
trojan botnet zloader

Badlisted process makes network request 15 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
2	896	msiexec.exe
3	896	msiexec.exe
4	896	msiexec.exe
5	896	msiexec.exe
6	896	msiexec.exe
7	896	msiexec.exe
11	896	msiexec.exe
12	896	msiexec.exe
13	896	msiexec.exe
14	896	msiexec.exe
15	896	msiexec.exe
17	896	msiexec.exe
18	896	msiexec.exe
19	896	msiexec.exe
20	896	msiexec.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4904 set thread context of 896	4904	rundll32.exe	81

System Location Discovery: System Language Discovery 1 TTPs 2 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msiexec.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeSecurityPrivilege	896	msiexec.exe
Token: SeSecurityPrivilege	896	msiexec.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3904 wrote to memory of 4904	3904	rundll32.exe	80
PID 4904 wrote to memory of 896	4904	rundll32.exe	81
PID 4904 wrote to memory of 896	4904	rundll32.exe	81

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\tmpyyhrv0os.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3904
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\tmpyyhrv0os.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4904
- - C:\Windows\SysWOW64\msiexec.exe
    msiexec.exe
    3⤵
    - Badlisted process makes network request
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:896

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

Replay Monitor

Loading Replay Monitor...

Downloads

memory/896-0-0x0000000000640000-0x0000000000669000-memory.dmp

Download

memory/896-2-0x0000000000640000-0x0000000000669000-memory.dmp

Download

memory/896-3-0x0000000000640000-0x0000000000669000-memory.dmp

Download

memory/896-4-0x0000000000640000-0x0000000000669000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads