b42a576bf6add29c9112a395b25ce9a7f7377b7efb9115f9c3f5870f758cab06

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
21/01/2025, 04:08

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General

Target

b42a576bf6add29c9112a395b25ce9a7f7377b7efb9115f9c3f5870f758cab06N.dll
Size

564KB
MD5

6af786a1c2ac0f606d50f9f5d7d1cfb0
SHA1

f9c813cc11b29a17b238f013495ab1e121020a7f
SHA256

b42a576bf6add29c9112a395b25ce9a7f7377b7efb9115f9c3f5870f758cab06
SHA512

a32b14d97d326bd0dae373818d692edabd6104c55ee190dcfa0a054ced1835f6c0865e869b158bb8553ee7cf12130296cc5fd55a631050fbb192b56efd70efa7
SSDEEP

12288:tehnaNPpSVZmNxRCwnwm3W3OHIIf5m9RhWFV2:teh0PpS6NxNnwYeOHXAhWT2

Score

7^/10

discovery upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
2748	rundll32mgr.exe

Loads dropped DLL 2 IoCs

pid	Process
2656	rundll32.exe
2656	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rundll32mgr.exe	rundll32.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/2748-14-0x0000000000400000-0x0000000000421000-memory.dmp	upx
behavioral1/memory/2748-16-0x0000000000400000-0x0000000000421000-memory.dmp	upx
behavioral1/memory/2748-15-0x0000000000400000-0x0000000000421000-memory.dmp	upx
behavioral1/memory/2748-13-0x0000000000400000-0x0000000000421000-memory.dmp	upx

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	rundll32mgr.exe

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
2748	rundll32mgr.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2660 wrote to memory of 2656	2660	rundll32.exe	30
PID 2656 wrote to memory of 2748	2656	rundll32.exe	31
PID 2656 wrote to memory of 2748	2656	rundll32.exe	31
PID 2656 wrote to memory of 2748	2656	rundll32.exe	31
PID 2656 wrote to memory of 2748	2656	rundll32.exe	31

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b42a576bf6add29c9112a395b25ce9a7f7377b7efb9115f9c3f5870f758cab06N.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2660
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b42a576bf6add29c9112a395b25ce9a7f7377b7efb9115f9c3f5870f758cab06N.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2656
- - C:\Windows\SysWOW64\rundll32mgr.exe
    C:\Windows\SysWOW64\rundll32mgr.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of UnmapMainImage
    PID:2748

Network

MITRE ATT&CK Enterprise v15

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

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Downloads

\Windows\SysWOW64\rundll32mgr.exe

Filesize
164KB

MD5
a3b1f1c4cd75bea10095e054f990bf1d

SHA1
15bf037b2166d2533e12bbec9f1d5f9a3ad8c81b

SHA256
a4c51942f696650a7ce0530a88c3742380ac82bc1ddc75c24d1417f0958caaee

SHA512
7457591c9676baa6043e4c3ae6ede364f19964c4e4e6a91a06e148221402791cabf9d5ab2bfcb629120ab136fee0a2994c0830f7cbfb112c5c6b07109b6a1a94

Download Submit
memory/2656-10-0x0000000000340000-0x0000000000374000-memory.dmp

Filesize
208KB

Download
memory/2656-9-0x0000000010000000-0x000000001008B000-memory.dmp

Filesize
556KB

Download
memory/2656-4-0x0000000010000000-0x000000001008B000-memory.dmp

Filesize
556KB

Download
memory/2656-1-0x0000000010000000-0x000000001008B000-memory.dmp

Filesize
556KB

Download
memory/2748-12-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2748-14-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2748-16-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2748-15-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2748-13-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download