a630695fa734022ecb859d6cb6932b1f683f575a94b2193c4bac635673943249

Analysis

max time kernel
151s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24-11-2022 21:13

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General

Target

gpa_cal.exe
Size

43KB
MD5

4e05534f1b1a17eea6e372ef1abd735e
SHA1

5a93caa8a184b56afd6d7569b1b049d908ea7c17
SHA256

976f0eab8e1394dcecd01ab989d26ccf9fc383c1c91acc0a7530348d5c5b759a
SHA512

262b6e6d2fd58302fcbc54ae51ef3d78d118cd74ab4bd783c5af063df04a672160fe0e5d8e274fe0a4e9a17aa0c4fd301203e1303c2c0ae51aa25e2ffcd37824
SSDEEP

768:XAyNMrbxn9kXhFVzrzkOUIAewWxk8VhTqDgCqo:QymgFxkExTVhoq

Score

8^/10

evasion persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

Avastlt.exe

pid process

5068 Avastlt.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

812 netsh.exe
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:

gpa_cal.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation gpa_cal.exe

pid	process
812	netsh.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	gpa_cal.exe

Drops startup file 2 IoCs

Processes:

Avastlt.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2f2b25bdc1662b44aed8777af0c3c8f7.exe	Avastlt.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2f2b25bdc1662b44aed8777af0c3c8f7.exe	Avastlt.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

Avastlt.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\2f2b25bdc1662b44aed8777af0c3c8f7 = "\"C:\\Users\\Admin\\AppData\\Roaming\\Avastlt.exe\" .."	Avastlt.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\2f2b25bdc1662b44aed8777af0c3c8f7 = "\"C:\\Users\\Admin\\AppData\\Roaming\\Avastlt.exe\" .."	Avastlt.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 25 IoCs

Processes:

Avastlt.exe

pid	process
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe
5068	Avastlt.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Avastlt.exe

description pid process

Token: SeDebugPrivilege 5068 Avastlt.exe

description	pid	process
Token: SeDebugPrivilege	5068	Avastlt.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

gpa_cal.exeAvastlt.exe

description	pid	process	target process
PID 3820 wrote to memory of 5068	3820	gpa_cal.exe	Avastlt.exe
PID 3820 wrote to memory of 5068	3820	gpa_cal.exe	Avastlt.exe
PID 3820 wrote to memory of 5068	3820	gpa_cal.exe	Avastlt.exe
PID 5068 wrote to memory of 812	5068	Avastlt.exe	netsh.exe
PID 5068 wrote to memory of 812	5068	Avastlt.exe	netsh.exe
PID 5068 wrote to memory of 812	5068	Avastlt.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\gpa_cal.exe
"C:\Users\Admin\AppData\Local\Temp\gpa_cal.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3820

C:\Users\Admin\AppData\Roaming\Avastlt.exe
"C:\Users\Admin\AppData\Roaming\Avastlt.exe"
2⤵
- Executes dropped EXE
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5068

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\Avastlt.exe" "Avastlt.exe" ENABLE
3⤵
- Modifies Windows Firewall
PID:812

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Avastlt.exe

Filesize
43KB

MD5
4e05534f1b1a17eea6e372ef1abd735e

SHA1
5a93caa8a184b56afd6d7569b1b049d908ea7c17

SHA256
976f0eab8e1394dcecd01ab989d26ccf9fc383c1c91acc0a7530348d5c5b759a

SHA512
262b6e6d2fd58302fcbc54ae51ef3d78d118cd74ab4bd783c5af063df04a672160fe0e5d8e274fe0a4e9a17aa0c4fd301203e1303c2c0ae51aa25e2ffcd37824

Download Submit
C:\Users\Admin\AppData\Roaming\Avastlt.exe

Filesize
43KB

MD5
4e05534f1b1a17eea6e372ef1abd735e

SHA1
5a93caa8a184b56afd6d7569b1b049d908ea7c17

SHA256
976f0eab8e1394dcecd01ab989d26ccf9fc383c1c91acc0a7530348d5c5b759a

SHA512
262b6e6d2fd58302fcbc54ae51ef3d78d118cd74ab4bd783c5af063df04a672160fe0e5d8e274fe0a4e9a17aa0c4fd301203e1303c2c0ae51aa25e2ffcd37824

Download Submit
memory/812-137-0x0000000000000000-mapping.dmp

Download
memory/3820-132-0x0000000075510000-0x0000000075AC1000-memory.dmp

Filesize
5.7MB

Download
memory/3820-136-0x0000000075510000-0x0000000075AC1000-memory.dmp

Filesize
5.7MB

Download
memory/5068-133-0x0000000000000000-mapping.dmp

Download
memory/5068-138-0x0000000075510000-0x0000000075AC1000-memory.dmp

Filesize
5.7MB

Download
memory/5068-139-0x0000000075510000-0x0000000075AC1000-memory.dmp

Filesize
5.7MB

Download