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

resource	yara_rule
behavioral2/memory/4468-147-0x0000000000400000-0x000000000044E000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	BLToolsMod.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	Updater-File.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	RegAsm.exe

Executes dropped EXE 1 IoCs

pid	Process
1092	Updater-File.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\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.

flow	ioc
14	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1092 set thread context of 4468	1092	Updater-File.exe	86

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

pid	pid_target	Process	procid_target
2884	1044	WerFault.exe	80

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2708	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3584	powershell.exe
3584	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1044	BLToolsMod.exe
Token: SeDebugPrivilege	1092	Updater-File.exe
Token: SeDebugPrivilege	3584	powershell.exe
Token: SeDebugPrivilege	4468	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4468	RegAsm.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1044 wrote to memory of 1092	1044	BLToolsMod.exe	81
PID 1044 wrote to memory of 1092	1044	BLToolsMod.exe	81
PID 1044 wrote to memory of 1092	1044	BLToolsMod.exe	81
PID 1092 wrote to memory of 3584	1092	Updater-File.exe	84
PID 1092 wrote to memory of 3584	1092	Updater-File.exe	84
PID 1092 wrote to memory of 3584	1092	Updater-File.exe	84
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 1092 wrote to memory of 4468	1092	Updater-File.exe	86
PID 4468 wrote to memory of 3736	4468	RegAsm.exe	94
PID 4468 wrote to memory of 3736	4468	RegAsm.exe	94
PID 4468 wrote to memory of 3736	4468	RegAsm.exe	94
PID 3736 wrote to memory of 3096	3736	cmd.exe	96
PID 3736 wrote to memory of 3096	3736	cmd.exe	96
PID 3736 wrote to memory of 3096	3736	cmd.exe	96
PID 3736 wrote to memory of 2708	3736	cmd.exe	97
PID 3736 wrote to memory of 2708	3736	cmd.exe	97
PID 3736 wrote to memory of 2708	3736	cmd.exe	97

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:1044
- 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:1092
- - 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:3584
- - 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:4468
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\fY9EA2uCwBak.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3736
    - - C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        5⤵
        
        PID:3096
    - - C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        5⤵
        Runs ping.exe
        
        PID:2708
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1044 -s 2092
  2⤵
  - Program crash
  PID:2884

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1044 -ip 1044
1⤵
PID:1444

Network

MITRE ATT&CK Enterprise 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

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\fY9EA2uCwBak.bat

Filesize
270B

MD5
4ce5fcfe8a00948d11a0a13fa662f60e

SHA1
87e67ff0de0c1498ea243b7e6db7c8152e496166

SHA256
8df3fe0ac24645ae3478b808060c5ef88ec05761ce78bc7982b8b4617ee4a870

SHA512
57b5716081491cc4ec7f73508bc9aa43514f35d53a72d6260d579b4864e721c2354ac8d82870f2391923ce18b42168e9bbb5e5069039e51675f361bfe81ada4d

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

Filesize
224B

MD5
12f9f5bf70ef4de07fa3fc66eaeda84f

SHA1
ad4c4aeac53e8733df60a15dc57de5c445253158

SHA256
01cbdcccd837a2a69a63048c39ab230a0b390a10a24a68b5db2641a0a0e0cac9

SHA512
3a5fbb6a827080048a83f52b7605bbeed90754bbc6d3827dc5cf2391f26ef5b9e10069a26d2cd3bbce842222d8c8cfbc62619190ed3bc9d26c3d9413d1406dc6

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/1044-132-0x0000000000170000-0x0000000000234000-memory.dmp

Filesize
784KB

Download
memory/1092-136-0x00000000007B0000-0x00000000007B8000-memory.dmp

Filesize
32KB

Download
memory/1092-137-0x00000000063C0000-0x00000000063E2000-memory.dmp

Filesize
136KB

Download
memory/3584-144-0x0000000007540000-0x0000000007BBA000-memory.dmp

Filesize
6.5MB

Download
memory/3584-142-0x0000000005710000-0x0000000005776000-memory.dmp

Filesize
408KB

Download
memory/3584-145-0x00000000061B0000-0x00000000061CA000-memory.dmp

Filesize
104KB

Download
memory/3584-139-0x00000000023F0000-0x0000000002426000-memory.dmp

Filesize
216KB

Download
memory/3584-140-0x0000000004F90000-0x00000000055B8000-memory.dmp

Filesize
6.2MB

Download
memory/3584-143-0x0000000005D30000-0x0000000005D4E000-memory.dmp

Filesize
120KB

Download
memory/3584-141-0x0000000005630000-0x0000000005696000-memory.dmp

Filesize
408KB

Download
memory/4468-149-0x00000000056F0000-0x0000000005782000-memory.dmp

Filesize
584KB

Download
memory/4468-152-0x0000000006B80000-0x0000000006B8A000-memory.dmp

Filesize
40KB

Download
memory/4468-151-0x0000000006810000-0x000000000684C000-memory.dmp

Filesize
240KB

Download
memory/4468-150-0x00000000063F0000-0x0000000006402000-memory.dmp

Filesize
72KB

Download
memory/4468-148-0x0000000005C00000-0x00000000061A4000-memory.dmp

Filesize
5.6MB

Download
memory/4468-147-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download

Analysis

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