39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466

Analysis

max time kernel
143s
max time network
128s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
22-05-2024 20:35

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General

Target

39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe
Size

134KB
MD5

42bc82cbc51846456552ef9857f3311c
SHA1

0270665b27de798e67d8b0cab3934427d7749295
SHA256

39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466
SHA512

e4994d99b0b5d182da251a2ef7d4614bb65e9d4a8350bad2791456edcfac47a07d2d9de9699e13084c68e35edfaa6dd9b0361d80e8ec14e81df2877d996c67c4
SSDEEP

1536:YGYU/W2/HG6QMauSV3ixJHABLrmhH7i9eNOOg00GqMIK7aGZh3SOa:YfU/WF6QMauSuiWNi9eNOl0007NZIOa

Score

9^/10

persistence upx

Malware Config

Signatures

UPX dump on OEP (original entry point) 6 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1848-0-0x0000000000CA0000-0x0000000000CC8000-memory.dmp	UPX
C:\ProgramData\Update\wuauclt.exe	UPX
behavioral2/memory/4460-4-0x0000000000ED0000-0x0000000000EF8000-memory.dmp	UPX
behavioral2/memory/1848-6-0x0000000000CA0000-0x0000000000CC8000-memory.dmp	UPX
behavioral2/memory/4460-7-0x0000000000ED0000-0x0000000000EF8000-memory.dmp	UPX
behavioral2/memory/1848-8-0x0000000000CA0000-0x0000000000CC8000-memory.dmp	UPX

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe

Executes dropped EXE 1 IoCs

Processes:

wuauclt.exe

pid process

4460 wuauclt.exe

pid	process
4460	wuauclt.exe

UPX packed file 6 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1848-0-0x0000000000CA0000-0x0000000000CC8000-memory.dmp	upx
C:\ProgramData\Update\wuauclt.exe	upx
behavioral2/memory/4460-4-0x0000000000ED0000-0x0000000000EF8000-memory.dmp	upx
behavioral2/memory/1848-6-0x0000000000CA0000-0x0000000000CC8000-memory.dmp	upx
behavioral2/memory/4460-7-0x0000000000ED0000-0x0000000000EF8000-memory.dmp	upx
behavioral2/memory/1848-8-0x0000000000CA0000-0x0000000000CC8000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Window Update = "\"C:\\ProgramData\\Update\\wuauclt.exe\" /run"	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe

description	pid	process	target process
PID 1848 wrote to memory of 4460	1848	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe	wuauclt.exe
PID 1848 wrote to memory of 4460	1848	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe	wuauclt.exe
PID 1848 wrote to memory of 4460	1848	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe	wuauclt.exe
PID 1848 wrote to memory of 1916	1848	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe	cmd.exe
PID 1848 wrote to memory of 1916	1848	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe	cmd.exe
PID 1848 wrote to memory of 1916	1848	39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe
"C:\Users\Admin\AppData\Local\Temp\39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1848

C:\ProgramData\Update\wuauclt.exe
"C:\ProgramData\Update\wuauclt.exe" /run
2⤵
- Executes dropped EXE
PID:4460

C:\windows\SysWOW64\cmd.exe
"C:\windows\system32\cmd.exe" /c del /q "C:\Users\Admin\AppData\Local\Temp\39c4c860bb70156ce79ab0e6d82472ca8699f715b2c01ceea3dde8b30ef99466.exe" >> NUL
2⤵
PID:1916

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

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\ProgramData\Update\wuauclt.exe
Filesize
134KB

MD5
729090c71741d2471301434f596631a5

SHA1
366da0588a54d47d5f3208302953628d33361508

SHA256
dec7c1e6935122a5a176deb400818b3aa09c66667e5017a86e580e056ca2f093

SHA512
e3a4663d6b0513e0c36bcf8e890e9ac01479a7ea69a21a6aae78dff4b6b20901c2f49e8c0afae39800489f53baf1a47734ae09678cd5ecc5495964bebafe55d1

Download Submit
memory/1848-0-0x0000000000CA0000-0x0000000000CC8000-memory.dmp

Filesize
160KB

Download
memory/1848-6-0x0000000000CA0000-0x0000000000CC8000-memory.dmp

Filesize
160KB

Download
memory/1848-8-0x0000000000CA0000-0x0000000000CC8000-memory.dmp

Filesize
160KB

Download
memory/4460-4-0x0000000000ED0000-0x0000000000EF8000-memory.dmp

Filesize
160KB

Download
memory/4460-7-0x0000000000ED0000-0x0000000000EF8000-memory.dmp

Filesize
160KB

Download