quasar | 305cfdd7d464938cabe66fcf3116df431c10742c775a4a588d38349ea18a7fb6

General

Target

BLToolsMod.exe
Size

763KB
MD5

869037e716218fb7551d84b8ce7d0ae7
SHA1

12cb776519eeb2d5e6a7ab1ddce3a09f143d5f18
SHA256

305cfdd7d464938cabe66fcf3116df431c10742c775a4a588d38349ea18a7fb6
SHA512

6840e10d1daeacd169dba4a0049bc3b9087726dd45551b9a9587d57ec45d926356ce1656a39fdf35c1acb4020c564ec1f6a910fd83cde99e3ff75195728c72d2
SSDEEP

12288:SAZdPU5ttcsREhy5IYU8OaNISOvsk0gnT467zpmw7OfimWm/YfdFxfJ:S2UVc+EhyuAOaNIBXnT46fpmiOfimWy4

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office04

C2

youhackernetpaingodxd.duckdns.org:5557

blablashitspreading.ddns.net:5557

Mutex

xEoEv3HHdyEIYwJRFM

Attributes

encryption_key
w3WfcmWh1iXT9cxeKFEX
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1140-147-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar

Downloads MZ/PE file

Checks computer location settings 2 TTPs 3 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

BLToolsMod.exeUpdater-File.exeRegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	BLToolsMod.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	Updater-File.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	RegAsm.exe

Executes dropped EXE 1 IoCs

Processes:

Updater-File.exe

pid process

4636 Updater-File.exe

pid	process
4636	Updater-File.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

Updater-File.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Driver = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Driver.exe\""	Updater-File.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

37 ip-api.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

Updater-File.exe

description pid process target process

PID 4636 set thread context of 1140 4636 Updater-File.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1356 3376 WerFault.exe BLToolsMod.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

4584 PING.EXE
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

1704 powershell.exe
1704 powershell.exe

flow	ioc
37	ip-api.com

description	pid	process	target process
PID 4636 set thread context of 1140	4636	Updater-File.exe	RegAsm.exe

pid	pid_target	process	target process
1356	3376	WerFault.exe	BLToolsMod.exe

pid	process
4584	PING.EXE

pid	process
1704	powershell.exe
1704	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

BLToolsMod.exeUpdater-File.exepowershell.exeRegAsm.exe

description	pid	process
Token: SeDebugPrivilege	3376	BLToolsMod.exe
Token: SeDebugPrivilege	4636	Updater-File.exe
Token: SeDebugPrivilege	1704	powershell.exe
Token: SeDebugPrivilege	1140	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RegAsm.exe

pid process

1140 RegAsm.exe

pid	process
1140	RegAsm.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

BLToolsMod.exeUpdater-File.exeRegAsm.execmd.exe

description	pid	process	target process
PID 3376 wrote to memory of 4636	3376	BLToolsMod.exe	Updater-File.exe
PID 3376 wrote to memory of 4636	3376	BLToolsMod.exe	Updater-File.exe
PID 3376 wrote to memory of 4636	3376	BLToolsMod.exe	Updater-File.exe
PID 4636 wrote to memory of 1704	4636	Updater-File.exe	powershell.exe
PID 4636 wrote to memory of 1704	4636	Updater-File.exe	powershell.exe
PID 4636 wrote to memory of 1704	4636	Updater-File.exe	powershell.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 4636 wrote to memory of 1140	4636	Updater-File.exe	RegAsm.exe
PID 1140 wrote to memory of 4544	1140	RegAsm.exe	cmd.exe
PID 1140 wrote to memory of 4544	1140	RegAsm.exe	cmd.exe
PID 1140 wrote to memory of 4544	1140	RegAsm.exe	cmd.exe
PID 4544 wrote to memory of 3700	4544	cmd.exe	chcp.com
PID 4544 wrote to memory of 3700	4544	cmd.exe	chcp.com
PID 4544 wrote to memory of 3700	4544	cmd.exe	chcp.com
PID 4544 wrote to memory of 4584	4544	cmd.exe	PING.EXE
PID 4544 wrote to memory of 4584	4544	cmd.exe	PING.EXE
PID 4544 wrote to memory of 4584	4544	cmd.exe	PING.EXE

C:\Users\Admin\AppData\Local\Temp\BLToolsMod.exe
"C:\Users\Admin\AppData\Local\Temp\BLToolsMod.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3376

C:\Users\Admin\AppData\Roaming\Updater-File.exe
"C:\Users\Admin\AppData\Roaming\Updater-File.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4636

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1704

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
3⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1140

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\MsYYveiMG7iU.bat" "
4⤵
- Suspicious use of WriteProcessMemory
PID:4544

C:\Windows\SysWOW64\chcp.com
chcp 65001
5⤵
PID:3700

C:\Windows\SysWOW64\PING.EXE
ping -n 10 localhost
5⤵
- Runs ping.exe
PID:4584

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3376 -s 2096
2⤵
- Program crash
PID:1356

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 3376 -ip 3376
1⤵
PID:4748

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Remote System Discovery

1

T1018

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\MsYYveiMG7iU.bat
Filesize
270B

MD5
5ebfd51bdc4b72d54bc91ac8a6065e98

SHA1
5d46152b2a9033f09edd49c77829203f35e20584

SHA256
1372936306530f91e7459f31ee483188bf28a7c481a59a6805133f09d349906f

SHA512
a19e148f3be56ee6d2042769f8be73e1cb0600473d3fae346779f98fe09b909e7cb8267e7fa2bb358e0cd7d93806abd260860044f097e0d885e93996f0cd5c49

Download Submit
C:\Users\Admin\AppData\Roaming\Logs\02-05-~1
Filesize
224B

MD5
f81fec59640307ba7b3202172d206729

SHA1
ab90c240b8c3b23a6c06c119a028903a58afce3d

SHA256
e79eb0a2f9b56966a8336200336123baffad193e193fed675f4eba468cb30d0f

SHA512
397ebf45d2fa62a956443546de0c33fd254bc3891fc6159172790bbc0fcaf320f4ada3ea14fe1c0d94a696716bdb640a055fe2cd2275e3f268569febb276d1cd

Download Submit
C:\Users\Admin\AppData\Roaming\Updater-File.exe
Filesize
6KB

MD5
be2c9d9f3e9206eb7d809157ea37d0ea

SHA1
79fc984efb6d9e58c21f7c5dee8de2fc44710f62

SHA256
f07ca31e483745ac9fe74da53f939a797f3f8868717eb29f9f0d1286b89f6b79

SHA512
2510583a2690be0c48614fa21d24c2919d6c4f704d897ed4bb5a523d0bbc3616bd2aba7a6b22120068a24aa756a9b6f37feeb2b8eb461b86c2eacde935478d4b

Download Submit
C:\Users\Admin\AppData\Roaming\Updater-File.exe
Filesize
6KB

MD5
be2c9d9f3e9206eb7d809157ea37d0ea

SHA1
79fc984efb6d9e58c21f7c5dee8de2fc44710f62

SHA256
f07ca31e483745ac9fe74da53f939a797f3f8868717eb29f9f0d1286b89f6b79

SHA512
2510583a2690be0c48614fa21d24c2919d6c4f704d897ed4bb5a523d0bbc3616bd2aba7a6b22120068a24aa756a9b6f37feeb2b8eb461b86c2eacde935478d4b

Download Submit
memory/1140-146-0x0000000000000000-mapping.dmp

Download
memory/1140-152-0x0000000006610000-0x000000000661A000-memory.dmp

Filesize
40KB

Download
memory/1140-151-0x00000000062A0000-0x00000000062DC000-memory.dmp

Filesize
240KB

Download
memory/1140-150-0x00000000056B0000-0x00000000056C2000-memory.dmp

Filesize
72KB

Download
memory/1140-149-0x0000000005140000-0x00000000051D2000-memory.dmp

Filesize
584KB

Download
memory/1140-148-0x00000000056F0000-0x0000000005C94000-memory.dmp

Filesize
5.6MB

Download
memory/1140-147-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1704-138-0x0000000000000000-mapping.dmp

Download
memory/1704-139-0x0000000004940000-0x0000000004976000-memory.dmp

Filesize
216KB

Download
memory/1704-145-0x00000000063E0000-0x00000000063FA000-memory.dmp

Filesize
104KB

Download
memory/1704-143-0x0000000005ED0000-0x0000000005EEE000-memory.dmp

Filesize
120KB

Download
memory/1704-142-0x0000000005850000-0x00000000058B6000-memory.dmp

Filesize
408KB

Download
memory/1704-141-0x00000000057E0000-0x0000000005846000-memory.dmp

Filesize
408KB

Download
memory/1704-140-0x00000000050A0000-0x00000000056C8000-memory.dmp

Filesize
6.2MB

Download
memory/1704-144-0x0000000007520000-0x0000000007B9A000-memory.dmp

Filesize
6.5MB

Download
memory/3376-132-0x0000000000C50000-0x0000000000D14000-memory.dmp

Filesize
784KB

Download
memory/3700-155-0x0000000000000000-mapping.dmp

Download
memory/4544-153-0x0000000000000000-mapping.dmp

Download
memory/4584-156-0x0000000000000000-mapping.dmp

Download
memory/4636-137-0x0000000006840000-0x0000000006862000-memory.dmp

Filesize
136KB

Download
memory/4636-136-0x0000000000C30000-0x0000000000C38000-memory.dmp

Filesize
32KB

Download
memory/4636-133-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads