quasar | b373e9052f312689b1b3097c601ccb837917d52d9a0c10b6120457eb945bb1ac

Analysis

max time kernel
143s
max time network
139s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2025, 03:17

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General

Target

c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Size

947KB
MD5

964efbbcba7f76c77d831f02fdc30de4
SHA1

1ec5e6ac8d0154eca145460e1b349cd49b06fb46
SHA256

c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6
SHA512

a78d5134be0c9c4cbe44fb63309f895946a666306b757622c3d7e715d3c87d056a24dcdcf8f3cd303424ad00861d113ec7aa812088015fb2ec07b2b018a3f990
SSDEEP

24576:IOdMrF///F53jIWQuTXIZK131ZEhNT8rlwR4QM:ah

Score

10^/10

quasar office05 discovery persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office05

morelogs.thruhere.net:4788

Mutex

QSR_MUTEX_vpuZcEVGdqV4nkKTlB

Attributes

encryption_key
rHoRBOHzyexwZPVgy5QT
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT 3 IoCs

Quasar is an open source Remote Access Tool.

trojan spyware quasar

description	flow	ioc	Process
Key opened		\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
	69	ip-api.com	Process not Found
	77	ip-api.com	Process not Found

Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/412-8-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Key value queried	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winrar = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Winrar\\winrar.exe\""	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winrar = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Winrar\\winrar.exe\""	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
77	ip-api.com
69	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2924 set thread context of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 1004 set thread context of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 11 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3172	PING.EXE
4204	PING.EXE

Runs ping.exe 1 TTPs 2 IoCs

Remote System Discovery

T1018

pid	Process
4204	PING.EXE
3172	PING.EXE

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Token: SeDebugPrivilege	412	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Token: SeDebugPrivilege	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Token: SeDebugPrivilege	3716	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
Token: SeDebugPrivilege	3896	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 2924 wrote to memory of 412	2924	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	105
PID 412 wrote to memory of 2116	412	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	106
PID 412 wrote to memory of 2116	412	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	106
PID 412 wrote to memory of 2116	412	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	106
PID 2116 wrote to memory of 2708	2116	cmd.exe	108
PID 2116 wrote to memory of 2708	2116	cmd.exe	108
PID 2116 wrote to memory of 2708	2116	cmd.exe	108
PID 2116 wrote to memory of 3172	2116	cmd.exe	109
PID 2116 wrote to memory of 3172	2116	cmd.exe	109
PID 2116 wrote to memory of 3172	2116	cmd.exe	109
PID 2116 wrote to memory of 1004	2116	cmd.exe	110
PID 2116 wrote to memory of 1004	2116	cmd.exe	110
PID 2116 wrote to memory of 1004	2116	cmd.exe	110
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 1004 wrote to memory of 3716	1004	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	113
PID 3716 wrote to memory of 712	3716	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	114
PID 3716 wrote to memory of 712	3716	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	114
PID 3716 wrote to memory of 712	3716	c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe	114
PID 712 wrote to memory of 1852	712	cmd.exe	116
PID 712 wrote to memory of 1852	712	cmd.exe	116
PID 712 wrote to memory of 1852	712	cmd.exe	116
PID 712 wrote to memory of 4204	712	cmd.exe	117
PID 712 wrote to memory of 4204	712	cmd.exe	117
PID 712 wrote to memory of 4204	712	cmd.exe	117
PID 712 wrote to memory of 3896	712	cmd.exe	118
PID 712 wrote to memory of 3896	712	cmd.exe	118
PID 712 wrote to memory of 3896	712	cmd.exe	118

C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
"C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe"
1⤵
- Quasar RAT
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2924
- C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
  "C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:412
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\5rYjtPzra5BU.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2116
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      System Location Discovery: System Language Discovery
      PID:2708
  - - C:\Windows\SysWOW64\PING.EXE
      ping -n 10 localhost
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3172
  - - C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
      "C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe"
      4⤵
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1004
    - - C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
        
        "C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe"
        5⤵
        Checks computer location settings
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:3716
      - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RBDyb3Ivcs0V.bat" "
        6⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:712
        
        C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        7⤵
        System Location Discovery: System Language Discovery
        
        PID:1852
        
        C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        7⤵
        System Location Discovery: System Language Discovery
        System Network Configuration Discovery: Internet Connection Discovery
        Runs ping.exe
        
        PID:4204
        
        C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe
        
        "C:\Users\Admin\AppData\Local\Temp\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe"
        7⤵
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:3896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\c8f09665c4c94041dd63191d0ea1b0f5092dc636eea7191242a7d7da9d7fa8b6.exe.log

Filesize
318B

MD5
51157910b86291e93bd1968c56ca70fb

SHA1
b1ba3bdd6eb9aba9bf084b3d7987f7636e2aa4d9

SHA256
06e03bc8ce534b3c6b6e1d26b9a0ab0acdf09f06d46969144186a69fcf8129aa

SHA512
da5d08989ff38c56a512f7a4fb72102c06ffacd65ed6eb220551fdfb2e6899d77d83fabd1238d487c7901da7d406d0967975b0e1eab5d13f02c7d1e19559083f

Download Submit
C:\Users\Admin\AppData\Local\Temp\5rYjtPzra5BU.bat

Filesize
261B

MD5
a9052b6adacc6854fbb7f1beaee7ba1c

SHA1
885c9f4db726f13d46971b2522ac6e064018da30

SHA256
1983cbd203542598c8ea6e954512690ec73869239025654053297d998e8014b5

SHA512
0883779ae65956c6629ab4ff52efe2d9e9ed9f9b86bd78623254d92da1f4c47ad5b3a4523f616c634fa038387abbf9ffcbb7d692b0a04a8d7a1925f1e4d4dd18

Download Submit
C:\Users\Admin\AppData\Local\Temp\RBDyb3Ivcs0V.bat

Filesize
261B

MD5
d20e2ac0eafee3f112f7c7fd327d6e54

SHA1
a089818a63596511b54b99ef9f154688ee584a22

SHA256
a6101639f5901f8aecca07ef57aa413e394c033cc5f004c2609ebfb7929cea77

SHA512
13651012d1943cefd6dc156ecf94fe67804b620548b47954e3de28e619597075c4c0e3202dd098065e0e19f6e46d4bb98e0807e879eabf3131ac91a30159c1ba

Download Submit
memory/412-14-0x00000000052C0000-0x0000000005352000-memory.dmp

Filesize
584KB

Download
memory/412-15-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/412-22-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/412-17-0x00000000065A0000-0x00000000065DC000-memory.dmp

Filesize
240KB

Download
memory/412-8-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/412-16-0x0000000005760000-0x0000000005772000-memory.dmp

Filesize
72KB

Download
memory/412-11-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/412-13-0x00000000057B0000-0x0000000005D54000-memory.dmp

Filesize
5.6MB

Download
memory/2924-12-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/2924-0-0x000000007458E000-0x000000007458F000-memory.dmp

Filesize
4KB

Download
memory/2924-4-0x0000000000C10000-0x0000000000C76000-memory.dmp

Filesize
408KB

Download
memory/2924-3-0x0000000005250000-0x00000000052B6000-memory.dmp

Filesize
408KB

Download
memory/2924-7-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/2924-6-0x0000000000CF0000-0x0000000000D0C000-memory.dmp

Filesize
112KB

Download
memory/2924-2-0x000000007458E000-0x000000007458F000-memory.dmp

Filesize
4KB

Download
memory/2924-1-0x0000000000570000-0x0000000000662000-memory.dmp

Filesize
968KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads