zloader | 15737d37308fb5a8745afb8c34249e387bad9b1d001f2fcaa44b8c0333286861

Analysis

max time kernel
135s
max time network
135s
platform
windows10_x64
resource
win10
submitted
16-10-2020 13:48

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General

Target

YCRkFXS.dll
Size

764KB
MD5

1d36338becdf76e5245665e2833d8a38
SHA1

1c2c449a06873070a3e154069c8a71de3d6e908d
SHA256

15737d37308fb5a8745afb8c34249e387bad9b1d001f2fcaa44b8c0333286861
SHA512

391dfaab6326b9066d2be333eff53aab2c74a006fae5be93961d0bf1766d8ffb09c950093bbdcb7276047f574ba544f44c5f0835c0a0f3e764f02455fb375176

Score

10^/10

trojan botnet zloader persistence

Malware Config

Signatures

Zloader, Terdot, DELoader, ZeusSphinx
Zloader is a malware strain that was initially discovered back in August 2015.
trojan botnet zloader
Blacklisted process makes network request 2 IoCs

Processes:

msiexec.exe

flow pid process

17 1276 msiexec.exe
18 1276 msiexec.exe

flow	pid	process
17	1276	msiexec.exe
18	1276	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-1-5-21-2066881839-3229799743-3576549721-1000\Software\Microsoft\Windows\CurrentVersion\Run	msiexec.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2066881839-3229799743-3576549721-1000\Software\Microsoft\Windows\CurrentVersion\Run\Dexazuca = "regsvr32.exe /s C:\\Users\\Admin\\AppData\\Roaming\\Capi\\vaqaoto.dll"	msiexec.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

rundll32.exe

description pid process target process

PID 4000 set thread context of 1276 4000 rundll32.exe msiexec.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

msiexec.exe

description pid process

Token: SeSecurityPrivilege 1276 msiexec.exe
Token: SeSecurityPrivilege 1276 msiexec.exe

description	pid	process	target process
PID 4000 set thread context of 1276	4000	rundll32.exe	msiexec.exe

description	pid	process
Token: SeSecurityPrivilege	1276	msiexec.exe
Token: SeSecurityPrivilege	1276	msiexec.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

rundll32.exerundll32.exe

description	pid	process	target process
PID 3828 wrote to memory of 4000	3828	rundll32.exe	rundll32.exe
PID 3828 wrote to memory of 4000	3828	rundll32.exe	rundll32.exe
PID 3828 wrote to memory of 4000	3828	rundll32.exe	rundll32.exe
PID 4000 wrote to memory of 1276	4000	rundll32.exe	msiexec.exe
PID 4000 wrote to memory of 1276	4000	rundll32.exe	msiexec.exe
PID 4000 wrote to memory of 1276	4000	rundll32.exe	msiexec.exe
PID 4000 wrote to memory of 1276	4000	rundll32.exe	msiexec.exe
PID 4000 wrote to memory of 1276	4000	rundll32.exe	msiexec.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\YCRkFXS.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3828

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\YCRkFXS.dll,#1
2⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4000

C:\Windows\SysWOW64\msiexec.exe
msiexec.exe
3⤵
- Blacklisted process makes network request
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
PID:1276

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1276-1-0x0000000002600000-0x0000000002629000-memory.dmp

Filesize
164KB

Download
memory/1276-2-0x0000000000000000-mapping.dmp

Download
memory/4000-0-0x0000000000000000-mapping.dmp

Download