zloader | 2558251e3f8705e621bf2749648c77dce391f3cc870aac9a6fd7119ce79103a2

General

Target

2558251e3f8705e621bf2749648c77dce391f3cc870aac9a6fd7119ce79103a2.dll
Size

375KB
MD5

6947ee4228ab808e9c91d9d6cd7f6f21
SHA1

006fee40df6b2908d5a6a945fd47ddfe2f32f533
SHA256

2558251e3f8705e621bf2749648c77dce391f3cc870aac9a6fd7119ce79103a2
SHA512

f8c9618ad79a6b0ac574f59e6d06b8e56b037bd5f388122acc66928e2db913e1630fcd3f92078e53913fab71aaa680968c20be0ecc0f0375fc93a373280b6e8c

Score

10^/10

zloader caspam caspam botnet persistence trojan

Malware Config

Extracted

Family

zloader

Botnet

CASPAM

Campaign

CASPAM

C2

http://marchadvertisingnetwork4.com/post.php

http://marchadvertisingnetwork5.com/post.php

http://marchadvertisingnetwork6.com/post.php

http://marchadvertisingnetwork7.com/post.php

http://marchadvertisingnetwork8.com/post.php

http://marchadvertisingnetwork9.com/post.php

http://marchadvertisingnetwork10.com/post.php

Attributes

build_id
24

rc4.plain

Signatures

Zloader, Terdot, DELoader, ZeusSphinx
Zloader is a malware strain that was initially discovered back in August 2015.
trojan botnet zloader
Blocklisted process makes network request 3 IoCs

Processes:

msiexec.exe

flow pid process

38 4560 msiexec.exe
39 4560 msiexec.exe
40 4560 msiexec.exe

flow	pid	process
38	4560	msiexec.exe
39	4560	msiexec.exe
40	4560	msiexec.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

msiexec.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Windows\CurrentVersion\Run	msiexec.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Byyz = "rundll32.exe C:\\Users\\Admin\\AppData\\Roaming\\Ecci\\ekys.dll,DllRegisterServer"	msiexec.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

rundll32.exe

description pid process target process

PID 1456 set thread context of 4560 1456 rundll32.exe msiexec.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

msiexec.exe

description pid process

Token: SeSecurityPrivilege 4560 msiexec.exe
Token: SeSecurityPrivilege 4560 msiexec.exe

description	pid	process	target process
PID 1456 set thread context of 4560	1456	rundll32.exe	msiexec.exe

description	pid	process
Token: SeSecurityPrivilege	4560	msiexec.exe
Token: SeSecurityPrivilege	4560	msiexec.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

rundll32.exerundll32.exe

description	pid	process	target process
PID 4284 wrote to memory of 1456	4284	rundll32.exe	rundll32.exe
PID 4284 wrote to memory of 1456	4284	rundll32.exe	rundll32.exe
PID 4284 wrote to memory of 1456	4284	rundll32.exe	rundll32.exe
PID 1456 wrote to memory of 4560	1456	rundll32.exe	msiexec.exe
PID 1456 wrote to memory of 4560	1456	rundll32.exe	msiexec.exe
PID 1456 wrote to memory of 4560	1456	rundll32.exe	msiexec.exe
PID 1456 wrote to memory of 4560	1456	rundll32.exe	msiexec.exe
PID 1456 wrote to memory of 4560	1456	rundll32.exe	msiexec.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\2558251e3f8705e621bf2749648c77dce391f3cc870aac9a6fd7119ce79103a2.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4284

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\2558251e3f8705e621bf2749648c77dce391f3cc870aac9a6fd7119ce79103a2.dll,#1
2⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1456

C:\Windows\SysWOW64\msiexec.exe
msiexec.exe
3⤵
- Blocklisted process makes network request
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
PID:4560

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1456-130-0x0000000000000000-mapping.dmp

Download
memory/1456-132-0x00000000754D0000-0x000000007554D000-memory.dmp

Filesize
500KB

Download
memory/1456-131-0x00000000754D0000-0x0000000075500000-memory.dmp

Filesize
192KB

Download
memory/1456-133-0x00000000754D0000-0x000000007554D000-memory.dmp

Filesize
500KB

Download
memory/1456-136-0x00000000754D0000-0x000000007554D000-memory.dmp

Filesize
500KB

Download
memory/4560-134-0x0000000000000000-mapping.dmp

Download
memory/4560-135-0x0000000000770000-0x00000000007A0000-memory.dmp

Filesize
192KB

Download
memory/4560-137-0x0000000000770000-0x00000000007A0000-memory.dmp

Filesize
192KB

Download
memory/4560-138-0x0000000000770000-0x00000000007A0000-memory.dmp

Filesize
192KB

Download

Analysis

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