d16dddc1e9ad69c5ef67afd93eb801c74ca5b95ec8b46741786c8c8ec47b1b1d

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
24-05-2024 20:20

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General

Target

heur003.dll
Size

118KB
MD5

bb06f2c0d34812d455aecc790aab74d4
SHA1

b206b3f29a3823ac4dad859c13e32dfa1f5f92f0
SHA256

45f6c21d358f56679acb89adeda25e296ab0eb5518eda33a175a1e22cfd71e19
SHA512

f5a4d616fa5e55072c360101216fee9a43c26572910d68ad2b7b68e8fbd3ad0f68aeaa84ffc6bbcbfb8c32e2e82eb2a6f0f5b51d33e640e70c4fd495222042ad
SSDEEP

3072:+CL0FKkhYyoAwOSxoPMVsf0nQla8vxgs2N+r3rWM:+4Q9/RgPvSCsDr3r

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

rundll32.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe"	rundll32.exe

Modifies AppInit DLL entries 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1547.001

Modify Registry
T1112

Modifies system executable filetype association 2 TTPs 2 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

Processes:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	rundll32.exe

Modifies registry class 5 IoCs

Processes:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.key	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\ = "regfile"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 3540 wrote to memory of 4668	3540	rundll32.exe	rundll32.exe
PID 3540 wrote to memory of 4668	3540	rundll32.exe	rundll32.exe
PID 3540 wrote to memory of 4668	3540	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\heur003.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3540

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\heur003.dll,#1
2⤵
- Modifies WinLogon for persistence
- Modifies system executable filetype association
- Modifies registry class
PID:4668

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/4668-1-0x0000000000C70000-0x0000000000C9C000-memory.dmp

Filesize
176KB

Download
memory/4668-0-0x0000000010000000-0x0000000010024000-memory.dmp

Filesize
144KB

Download
memory/4668-2-0x0000000002400000-0x0000000002401000-memory.dmp

Filesize
4KB

Download
memory/4668-9-0x00000000023E0000-0x00000000023E1000-memory.dmp

Filesize
4KB

Download
memory/4668-10-0x0000000000750000-0x0000000000751000-memory.dmp

Filesize
4KB

Download
memory/4668-8-0x0000000000CE0000-0x0000000000CE1000-memory.dmp

Filesize
4KB

Download
memory/4668-7-0x0000000000C40000-0x0000000000C41000-memory.dmp

Filesize
4KB

Download
memory/4668-6-0x0000000000CF0000-0x0000000000CF1000-memory.dmp

Filesize
4KB

Download
memory/4668-5-0x00000000023C0000-0x00000000023C1000-memory.dmp

Filesize
4KB

Download
memory/4668-4-0x00000000023D0000-0x00000000023D1000-memory.dmp

Filesize
4KB

Download
memory/4668-3-0x0000000000740000-0x0000000000741000-memory.dmp

Filesize
4KB

Download
memory/4668-12-0x0000000002430000-0x0000000002431000-memory.dmp

Filesize
4KB

Download
memory/4668-11-0x0000000002410000-0x0000000002411000-memory.dmp

Filesize
4KB

Download