quasar | a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35

Analysis

max time kernel
145s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02-11-2024 11:58

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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 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1176-6-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

Processes:

downloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
2632	downloads.exe
2904	downloads.exe
1896	downloads.exe
2068	downloads.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
15	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exedownloads.exe

description	pid	Process	procid_target
PID 652 set thread context of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 set thread context of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 set thread context of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 2632 set thread context of 2904	2632	downloads.exe	99
PID 2632 set thread context of 1896	2632	downloads.exe	100
PID 2632 set thread context of 2068	2632	downloads.exe	102

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	Process	procid_target
2900	3840	WerFault.exe	87
4832	2904	WerFault.exe	99

System Location Discovery: System Language Discovery 1 TTPs 8 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:

downloads.exedownloads.exeschtasks.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exeschtasks.exedownloads.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.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
4560	schtasks.exe
3096	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Token: SeDebugPrivilege	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Token: SeDebugPrivilege	2632	downloads.exe
Token: SeDebugPrivilege	1896	downloads.exe

Suspicious use of WriteProcessMemory 57 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 3840	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 1176	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 652 wrote to memory of 3644	652	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	90
PID 1176 wrote to memory of 4560	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	94
PID 1176 wrote to memory of 4560	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	94
PID 1176 wrote to memory of 4560	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	94
PID 1176 wrote to memory of 2632	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	96
PID 1176 wrote to memory of 2632	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	96
PID 1176 wrote to memory of 2632	1176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	96
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 2904	2632	downloads.exe	99
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 1896	2632	downloads.exe	100
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 2632 wrote to memory of 2068	2632	downloads.exe	102
PID 1896 wrote to memory of 3096	1896	downloads.exe	105
PID 1896 wrote to memory of 3096	1896	downloads.exe	105
PID 1896 wrote to memory of 3096	1896	downloads.exe	105

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:652
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  PID:3840
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3840 -s 80
    3⤵
    - Program crash
    PID:2900
- 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:1176
- - 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⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4560
- - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
    "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2632
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      PID:2904
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2904 -s 80
        5⤵
        Program crash
        
        PID:4832
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1896
    - - 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⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:3096
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2068
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3644

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3840 -ip 3840
1⤵
PID:3328

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 2904 -ip 2904
1⤵
PID:4724

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

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe.log

Filesize
522B

MD5
0f39d6b9afc039d81ff31f65cbf76826

SHA1
8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8

SHA256
ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d

SHA512
5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9

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

Filesize
773KB

MD5
8fb841a089ce2c1c760ef67e5bde9a08

SHA1
9ba26c8f25a276a87175ae9eac909a8f4d97fd71

SHA256
a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35

SHA512
a16739df2c02ea5e2116e1f2283a0f57d0a57e52431fa746c3334df20fbb4e96db6d1c4c5ed47cb92cb491afcd170794a0b31bde1180cff13caaaa9be59aa8e4

Download Submit
memory/652-13-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/652-1-0x0000000000AE0000-0x0000000000BAA000-memory.dmp

Filesize
808KB

Download
memory/652-2-0x0000000007A90000-0x0000000007B7E000-memory.dmp

Filesize
952KB

Download
memory/652-3-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/652-4-0x00000000057B0000-0x000000000584C000-memory.dmp

Filesize
624KB

Download
memory/652-0-0x000000007451E000-0x000000007451F000-memory.dmp

Filesize
4KB

Download
memory/1176-12-0x00000000050A0000-0x0000000005132000-memory.dmp

Filesize
584KB

Download
memory/1176-11-0x0000000005520000-0x0000000005AC4000-memory.dmp

Filesize
5.6MB

Download
memory/1176-14-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/1176-8-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/1176-18-0x0000000005500000-0x0000000005512000-memory.dmp

Filesize
72KB

Download
memory/1176-20-0x00000000064B0000-0x00000000064EC000-memory.dmp

Filesize
240KB

Download
memory/1176-6-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/1176-25-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/1896-34-0x0000000006E40000-0x0000000006E4A000-memory.dmp

Filesize
40KB

Download
memory/3644-10-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/3644-15-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/3644-16-0x00000000057F0000-0x0000000005856000-memory.dmp

Filesize
408KB

Download
memory/3644-19-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download