quasar | 3c0a306740f04bc2f2edcb8e1f9324fcff0ade4b605b01de325db65ad67f48e9

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
03-11-2024 01:32

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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/1872-5-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

Processes:

downloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
4008	downloads.exe
4856	downloads.exe
2476	downloads.exe
4660	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
8	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exedownloads.exe

description	pid	Process	procid_target
PID 2176 set thread context of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 set thread context of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 set thread context of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 4008 set thread context of 4856	4008	downloads.exe	94
PID 4008 set thread context of 2476	4008	downloads.exe	95
PID 4008 set thread context of 4660	4008	downloads.exe	96

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
3000	4660	WerFault.exe	96

System Location Discovery: System Language Discovery 1 TTPs 9 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.exeschtasks.exedownloads.exedownloads.exedownloads.exeschtasks.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.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	schtasks.exe
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	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

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
2212	schtasks.exe
4864	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Token: SeDebugPrivilege	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
Token: SeDebugPrivilege	4008	downloads.exe
Token: SeDebugPrivilege	2476	downloads.exe

Suspicious use of WriteProcessMemory 57 IoCs

Processes:

a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exea0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 1872	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	87
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 4776	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	88
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 2176 wrote to memory of 3624	2176	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	89
PID 4776 wrote to memory of 2212	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	91
PID 4776 wrote to memory of 2212	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	91
PID 4776 wrote to memory of 2212	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	91
PID 4776 wrote to memory of 4008	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	93
PID 4776 wrote to memory of 4008	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	93
PID 4776 wrote to memory of 4008	4776	a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe	93
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 4856	4008	downloads.exe	94
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 2476	4008	downloads.exe	95
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 4008 wrote to memory of 4660	4008	downloads.exe	96
PID 2476 wrote to memory of 4864	2476	downloads.exe	100
PID 2476 wrote to memory of 4864	2476	downloads.exe	100
PID 2476 wrote to memory of 4864	2476	downloads.exe	100

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:2176
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1872
- 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:4776
- - 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:2212
- - 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:4008
  - - 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:4856
  - - 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:2476
    - - 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:4864
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      PID:4660
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4660 -s 80
        5⤵
        Program crash
        
        PID:3000
- C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  C:\Users\Admin\AppData\Local\Temp\a0fb85dec00548f95f3db18f567bcb75a9a083eebb637be6c88c2d2bf05e2a35.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3624

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4660 -ip 4660
1⤵
PID:4732

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\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/1872-12-0x00000000051D0000-0x0000000005262000-memory.dmp

Filesize
584KB

Download
memory/1872-22-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/1872-17-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/1872-5-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/1872-7-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/1872-10-0x0000000005640000-0x0000000005BE4000-memory.dmp

Filesize
5.6MB

Download
memory/2176-3-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/2176-14-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/2176-4-0x00000000059E0000-0x0000000005A7C000-memory.dmp

Filesize
624KB

Download
memory/2176-0-0x00000000743CE000-0x00000000743CF000-memory.dmp

Filesize
4KB

Download
memory/2176-2-0x0000000007D60000-0x0000000007E4E000-memory.dmp

Filesize
952KB

Download
memory/2176-1-0x0000000000DC0000-0x0000000000E8A000-memory.dmp

Filesize
808KB

Download
memory/2476-37-0x0000000006860000-0x000000000686A000-memory.dmp

Filesize
40KB

Download
memory/3624-15-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/3624-21-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/3624-13-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4776-18-0x0000000005500000-0x0000000005566000-memory.dmp

Filesize
408KB

Download
memory/4776-20-0x00000000062B0000-0x00000000062C2000-memory.dmp

Filesize
72KB

Download
memory/4776-16-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4776-23-0x0000000006930000-0x000000000696C000-memory.dmp

Filesize
240KB

Download
memory/4776-28-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4776-11-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download