quasar | 3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

Analysis

max time kernel
148s
max time network
108s
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 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 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3396-5-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 5 IoCs

Processes:

downloads.exedownloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
748	downloads.exe
392	downloads.exe
4576	downloads.exe
1760	downloads.exe
816	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:

b8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exe

description	pid	Process	procid_target
PID 4552 set thread context of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 set thread context of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 set thread context of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 392 set thread context of 4576	392	downloads.exe	106
PID 392 set thread context of 1760	392	downloads.exe	107
PID 392 set thread context of 816	392	downloads.exe	108

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	Process	procid_target
3116	3752	WerFault.exe	91
2836	1760	WerFault.exe	107

System Location Discovery: System Language Discovery 1 TTPs 10 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.exeschtasks.exeschtasks.exedownloads.exeb8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.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	schtasks.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	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	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 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exe

pid	Process
3776	schtasks.exe
1200	schtasks.exe
1876	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exe

pid	Process
3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Token: SeDebugPrivilege	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Token: SeDebugPrivilege	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe
Token: SeDebugPrivilege	392	downloads.exe
Token: SeDebugPrivilege	4576	downloads.exe

Suspicious use of UnmapMainImage 1 IoCs

Processes:

downloads.exe

pid	Process
1760	downloads.exe

Suspicious use of WriteProcessMemory 63 IoCs

Processes:

b8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exeb8fc2efcc33d3160f38fcb6b39319e6a.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 3396	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	89
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 1940	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	90
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 4552 wrote to memory of 3752	4552	b8fc2efcc33d3160f38fcb6b39319e6a.exe	91
PID 1940 wrote to memory of 3776	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe	96
PID 1940 wrote to memory of 3776	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe	96
PID 1940 wrote to memory of 3776	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe	96
PID 1940 wrote to memory of 748	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe	98
PID 1940 wrote to memory of 748	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe	98
PID 1940 wrote to memory of 748	1940	b8fc2efcc33d3160f38fcb6b39319e6a.exe	98
PID 3396 wrote to memory of 1200	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe	102
PID 3396 wrote to memory of 1200	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe	102
PID 3396 wrote to memory of 1200	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe	102
PID 3396 wrote to memory of 392	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe	104
PID 3396 wrote to memory of 392	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe	104
PID 3396 wrote to memory of 392	3396	b8fc2efcc33d3160f38fcb6b39319e6a.exe	104
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 4576	392	downloads.exe	106
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 1760	392	downloads.exe	107
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 392 wrote to memory of 816	392	downloads.exe	108
PID 4576 wrote to memory of 1876	4576	downloads.exe	111
PID 4576 wrote to memory of 1876	4576	downloads.exe	111
PID 4576 wrote to memory of 1876	4576	downloads.exe	111

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:4552
- C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3396
- - 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:1200
- - 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:392
  - - 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:4576
    - - 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:1876
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      Suspicious use of UnmapMainImage
      PID:1760
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 1760 -s 12
        5⤵
        Program crash
        
        PID:2836
  - - 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:816
- C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1940
- - 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:3776
- - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
    "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:748
- C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  C:\Users\Admin\AppData\Local\Temp\b8fc2efcc33d3160f38fcb6b39319e6a.exe
  2⤵
  PID:3752
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3752 -s 80
    3⤵
    - Program crash
    PID:3116

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 3752 -ip 3752
1⤵
PID:4572

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1760 -ip 1760
1⤵
PID:3964

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\b8fc2efcc33d3160f38fcb6b39319e6a.exe.log

Filesize
522B

MD5
0f39d6b9afc039d81ff31f65cbf76826

SHA1
8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8

SHA256
ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d

SHA512
5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9

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

Filesize
774KB

MD5
b8fc2efcc33d3160f38fcb6b39319e6a

SHA1
a61413a5b6c19b4a388e6c89aaa9304c657b3e08

SHA256
3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

SHA512
ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b

Download Submit
memory/1940-23-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/1940-18-0x0000000006420000-0x000000000645C000-memory.dmp

Filesize
240KB

Download
memory/1940-17-0x0000000005560000-0x0000000005572000-memory.dmp

Filesize
72KB

Download
memory/1940-16-0x0000000004F60000-0x0000000004FC6000-memory.dmp

Filesize
408KB

Download
memory/1940-15-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/1940-13-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/3396-5-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/3396-11-0x0000000005840000-0x00000000058D2000-memory.dmp

Filesize
584KB

Download
memory/3396-10-0x0000000005CA0000-0x0000000006244000-memory.dmp

Filesize
5.6MB

Download
memory/3396-14-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/3396-8-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/3396-28-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/4552-12-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/4552-0-0x0000000074A8E000-0x0000000074A8F000-memory.dmp

Filesize
4KB

Download
memory/4552-4-0x0000000005520000-0x00000000055BC000-memory.dmp

Filesize
624KB

Download
memory/4552-3-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/4552-2-0x00000000078A0000-0x000000000798E000-memory.dmp

Filesize
952KB

Download
memory/4552-1-0x0000000000900000-0x00000000009CA000-memory.dmp

Filesize
808KB

Download
memory/4576-36-0x0000000006F80000-0x0000000006F8A000-memory.dmp

Filesize
40KB

Download