zloader | 38bc13ef112b2f17d4d1a80243fac6a521b5d58228984aae0752d79487fa3b66

max time kernel
102s
max time network
140s
platform
windows10-2004_x64
resource
win10v2004-20250502-en
resource tags

arch:x64arch:x86image:win10v2004-20250502-enlocale:en-usos:windows10-2004-x64system
submitted
26/05/2025, 04:37

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General

Target
08751be484e1572995ebb085df1c2c6372084d63a64dce7fab28130d79a6ea2d.dll
Size 144KB
Sample250526-e88mysdj21
SHA256 08751be484e1572995ebb085df1c2c6372084d63a64dce7fab28130d79a6ea2d
MD5 9e9bb42a965b89a9dce86c8b36b24799
SHA1 e2d1161ac7fa3420648ba59f7a5315ed0acb04c2
SHA512 e5ba20e364c96260c821bc61eab51906e2075aa0d3755ef25aabfc8f6f9545452930be42d978d96e3a68e2b92120df4940b276c9872ebf36fa50913523c51ce8
SSDEEP 3072:ep1qwbk6Wbh/UR++pz1OBrNtZtHpspurmxwPtnneZY:epoP6WV/C116rNbtHpsYrmSP1neZY
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

zloader main 26.02.2020 botnet discovery persistence trojan

Malware Config

Extracted

Family

zloader

Botnet

main

Campaign

26.02.2020

https://airnaa.org/sound.php
https://banog.org/sound.php
https://rayonch.org/sound.php

Attributes

build_id
19

rc4.plain

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
5916	rundll32.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-1-5-21-3342576763-1998465526-3870295501-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Ugydadu = "rundll32.exe C:\\Users\\Admin\\AppData\\Roaming\\Adfy\\beudec.dll,DllRegisterServer"	msiexec.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2928 set thread context of 3244	2928	regsvr32.exe	97
PID 5916 set thread context of 2088	5916	rundll32.exe	110

System Location Discovery: System Language Discovery 1 TTPs 4 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msiexec.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeSecurityPrivilege	3244	msiexec.exe
Token: SeSecurityPrivilege	3244	msiexec.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 2928	3680	regsvr32.exe	85
PID 3680 wrote to memory of 2928	3680	regsvr32.exe	85
PID 3680 wrote to memory of 2928	3680	regsvr32.exe	85
PID 2928 wrote to memory of 3244	2928	regsvr32.exe	97
PID 2928 wrote to memory of 3244	2928	regsvr32.exe	97
PID 2928 wrote to memory of 3244	2928	regsvr32.exe	97
PID 2928 wrote to memory of 3244	2928	regsvr32.exe	97
PID 2928 wrote to memory of 3244	2928	regsvr32.exe	97
PID 2592 wrote to memory of 5664	2592	cmd.exe	100
PID 2592 wrote to memory of 5664	2592	cmd.exe	100
PID 5664 wrote to memory of 5916	5664	rundll32.exe	101
PID 5664 wrote to memory of 5916	5664	rundll32.exe	101
PID 5664 wrote to memory of 5916	5664	rundll32.exe	101
PID 5916 wrote to memory of 2088	5916	rundll32.exe	110
PID 5916 wrote to memory of 2088	5916	rundll32.exe	110
PID 5916 wrote to memory of 2088	5916	rundll32.exe	110
PID 5916 wrote to memory of 2088	5916	rundll32.exe	110
PID 5916 wrote to memory of 2088	5916	rundll32.exe	110

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\08751be484e1572995ebb085df1c2c6372084d63a64dce7fab28130d79a6ea2d.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:3680
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\08751be484e1572995ebb085df1c2c6372084d63a64dce7fab28130d79a6ea2d.dll
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2928
- - C:\Windows\SysWOW64\msiexec.exe
    msiexec.exe
    3⤵
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3244

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c rundll32.exe C:\Users\Admin\AppData\Roaming\Adfy\beudec.dll,DllRegisterServer
1⤵
- Suspicious use of WriteProcessMemory
PID:2592
- C:\Windows\system32\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Roaming\Adfy\beudec.dll,DllRegisterServer
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5664
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Roaming\Adfy\beudec.dll,DllRegisterServer
    3⤵
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:5916
  - - C:\Windows\SysWOW64\msiexec.exe
      msiexec.exe
      4⤵
      System Location Discovery: System Language Discovery
      PID:2088

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

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

beudec.dll

Path C:\Users\Admin\AppData\Roaming\Adfy\beudec.dll
Size 144KB
SHA256 08751be484e1572995ebb085df1c2c6372084d63a64dce7fab28130d79a6ea2d
MD5 9e9bb42a965b89a9dce86c8b36b24799
SHA1 e2d1161ac7fa3420648ba59f7a5315ed0acb04c2
SHA512 e5ba20e364c96260c821bc61eab51906e2075aa0d3755ef25aabfc8f6f9545452930be42d978d96e3a68e2b92120df4940b276c9872ebf36fa50913523c51ce8
SSDEEP 3072:ep1qwbk6Wbh/UR++pz1OBrNtZtHpspurmxwPtnneZY:epoP6WV/C116rNbtHpsYrmSP1neZY
MD5 SHA1 SHA512 SSDEEP

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memory/2088-4-0x0000000000720000-0x0000000000745000-memory.dmp

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memory/3244-0-0x0000000000320000-0x0000000000345000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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