quasar | a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35

Analysis

max time kernel
2s
max time network
150s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
02-11-2024 07:00

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General

Target

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Size

773KB
MD5

8fb841a089ce2c1c760ef67e5bde9a08
SHA1

9ba26c8f25a276a87175ae9eac909a8f4d97fd71
SHA256

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35
SHA512

a16739df2c02ea5e2116e1f2283a0f57d0a57e52431fa746c3334df20fbb4e96db6d1c4c5ed47cb92cb491afcd170794a0b31bde1180cff13caaaa9be59aa8e4
SSDEEP

24576:yoYAPo8TjClMteQB+JRVK7Ys4r7eTBp7cE7qzuS:yJFQjI9m+c7FpBZ7Iu

Score

10^/10

quasar vtroy discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

VTROY

31.13.224.12:61512

31.13.224.13:61513

Mutex

QSR_MUTEX_4Q2rJqiVyC7hohzbjx

Attributes

encryption_key
7Vp2dMCHrMjJthQ2Elyy
install_name
downloads.exe
log_directory
Logs
reconnect_delay
5000
startup_key
cssrse.exe
subdirectory
downloadupdates

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2472-8-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2472-6-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2472-4-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

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
2	ip-api.com

Suspicious use of SetThreadContext 3 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe

description	pid	Process	procid_target
PID 1980 set thread context of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 set thread context of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 set thread context of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32

System Location Discovery: System Language Discovery 1 TTPs 3 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

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exe

pid	Process
2876	schtasks.exe
1316	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe

description	pid	Process
Token: SeDebugPrivilege	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Token: SeDebugPrivilege	2472	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe

Suspicious use of WriteProcessMemory 31 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe

description	pid	Process	procid_target
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2472	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	30
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2496	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	31
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 1980 wrote to memory of 2888	1980	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	32
PID 2472 wrote to memory of 2876	2472	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	34
PID 2472 wrote to memory of 2876	2472	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	34
PID 2472 wrote to memory of 2876	2472	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	34
PID 2472 wrote to memory of 2876	2472	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	34

C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
"C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1980
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2472
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2876
- - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
    "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
    3⤵
    PID:2724
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      PID:2412
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      PID:3004
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      PID:884
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe" /rl HIGHEST /f
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:1316
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2496
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  PID:2888

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

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

C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe

Filesize
773KB

MD5
8fb841a089ce2c1c760ef67e5bde9a08

SHA1
9ba26c8f25a276a87175ae9eac909a8f4d97fd71

SHA256
a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35

SHA512
a16739df2c02ea5e2116e1f2283a0f57d0a57e52431fa746c3334df20fbb4e96db6d1c4c5ed47cb92cb491afcd170794a0b31bde1180cff13caaaa9be59aa8e4

Download Submit
memory/1980-16-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/1980-1-0x00000000001C0000-0x000000000028A000-memory.dmp

Filesize
808KB

Download
memory/1980-2-0x0000000006F30000-0x000000000701E000-memory.dmp

Filesize
952KB

Download
memory/1980-3-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/1980-0-0x0000000074A8E000-0x0000000074A8F000-memory.dmp

Filesize
4KB

Download
memory/2472-15-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2472-17-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2472-6-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2472-4-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2472-8-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2472-28-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2496-19-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2496-18-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2496-20-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2724-27-0x0000000001240000-0x000000000130A000-memory.dmp

Filesize
808KB

Download