quasar | 3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
02-11-2024 06:46

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General

Target

b8fc2efcc33d3160f38fcb6b39319e6a.exe
Size

774KB
MD5

b8fc2efcc33d3160f38fcb6b39319e6a
SHA1

a61413a5b6c19b4a388e6c89aaa9304c657b3e08
SHA256

3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a
SHA512

ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b
SSDEEP

24576:XBx+Lv/QRiHCywDv2JIh7tJIYZFk+XJJ:xeXBm2JIDJNDXJ

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/2956-4-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2956-6-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/3000-13-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

Processes:

downloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
2740	downloads.exe
1492	downloads.exe
2972	downloads.exe
2292	downloads.exe

Loads dropped DLL 4 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exe

pid	Process
2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe
2740	downloads.exe
2740	downloads.exe
2740	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
2	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exe

description	pid	Process	procid_target
PID 2516 set thread context of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 set thread context of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 set thread context of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2740 set thread context of 1492	2740	downloads.exe	37
PID 2740 set thread context of 2972	2740	downloads.exe	38
PID 2740 set thread context of 2292	2740	downloads.exe	39

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:

b8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exeschtasks.exedownloads.exedownloads.exedownloads.exeschtasks.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b8fc2efcc33d3160f38fcb6b39319e6a.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	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

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
2604	schtasks.exe
2504	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Token: SeDebugPrivilege	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Token: SeDebugPrivilege	2740	downloads.exe
Token: SeDebugPrivilege	2972	downloads.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 2956	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	30
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 3000	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	31
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2516 wrote to memory of 2864	2516	b8fc2efcc33d3160f38fcb6b39319e6a.exe	32
PID 2956 wrote to memory of 2604	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	34
PID 2956 wrote to memory of 2604	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	34
PID 2956 wrote to memory of 2604	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	34
PID 2956 wrote to memory of 2604	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	34
PID 2956 wrote to memory of 2740	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	36
PID 2956 wrote to memory of 2740	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	36
PID 2956 wrote to memory of 2740	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	36
PID 2956 wrote to memory of 2740	2956	b8fc2efcc33d3160f38fcb6b39319e6a.exe	36
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 1492	2740	downloads.exe	37
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2972	2740	downloads.exe	38
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2740 wrote to memory of 2292	2740	downloads.exe	39
PID 2972 wrote to memory of 2504	2972	downloads.exe	40
PID 2972 wrote to memory of 2504	2972	downloads.exe	40

C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
"C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2516
- C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2956
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2604
- - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
    "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2740
  - - 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:1492
  - - 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:2972
    - - 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:2504
  - - 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:2292
- C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3000
- C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  2⤵
  PID:2864

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

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

Filesize
774KB

MD5
b8fc2efcc33d3160f38fcb6b39319e6a

SHA1
a61413a5b6c19b4a388e6c89aaa9304c657b3e08

SHA256
3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

SHA512
ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b

Download Submit
memory/2516-17-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/2516-1-0x0000000000040000-0x000000000010A000-memory.dmp

Filesize
808KB

Download
memory/2516-2-0x0000000006CC0000-0x0000000006DAE000-memory.dmp

Filesize
952KB

Download
memory/2516-3-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/2516-0-0x00000000742DE000-0x00000000742DF000-memory.dmp

Filesize
4KB

Download
memory/2740-27-0x0000000001170000-0x000000000123A000-memory.dmp

Filesize
808KB

Download
memory/2956-4-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2956-18-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/2956-14-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/2956-6-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2956-28-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/3000-13-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/3000-16-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/3000-19-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/3000-20-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download