quasar | 76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f

General

Target

76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe
Size

476KB
MD5

da604719663cbe3104a8e962b6e0c1a4
SHA1

e0ce2c871f1d20623c328fb16d7adbb4277f011f
SHA256

76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f
SHA512

847c1916b35f53a0c5d7afd9770863ed3789eb2468cb3dfdc343e8c61baacbd4679d676c8de79ebe72d38c905922d2f2a958603cd53bc921aece803d9823a287
SSDEEP

12288:c3ONTjM4IvtoL1F3Q+9V/xj3CwZQ57YkQ9tnApd:oONjn1djxr5Q57Ykqt

Score

10^/10

quasar winrar execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

winrar

C2

winrar.ydns.eu:4782

Mutex

bCniKUdDhgLnMojfQG

Attributes

encryption_key
XNz8aG8ZYhW5neohUxbc
install_name
Caspol.exe
log_directory
Logs
reconnect_delay
3000
startup_key
AppLaunch
subdirectory
MonitorWindows

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4244-41-0x00000000031A0000-0x00000000031EE000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4404	powershell.exe
3136	powershell.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe

Executes dropped EXE 1 IoCs

pid	Process
4244	taskhostw.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.

flow	ioc
34	ip-api.com

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
264	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4404	powershell.exe
4404	powershell.exe
4404	powershell.exe
3136	powershell.exe
3136	powershell.exe
3136	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe
Token: SeBackupPrivilege	4068	vssvc.exe
Token: SeRestorePrivilege	4068	vssvc.exe
Token: SeAuditPrivilege	4068	vssvc.exe
Token: SeDebugPrivilege	4404	powershell.exe
Token: SeDebugPrivilege	3136	powershell.exe
Token: SeDebugPrivilege	4244	taskhostw.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4244	taskhostw.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 716 wrote to memory of 4404	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe	103
PID 716 wrote to memory of 4404	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe	103
PID 716 wrote to memory of 3136	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe	105
PID 716 wrote to memory of 3136	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe	105
PID 716 wrote to memory of 1480	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe	108
PID 716 wrote to memory of 1480	716	76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe	108
PID 1480 wrote to memory of 264	1480	cmd.exe	110
PID 1480 wrote to memory of 264	1480	cmd.exe	110

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe
"C:\Users\Admin\AppData\Local\Temp\76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:716
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\taskhostw.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4404
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'taskhostw.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3136
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA7B.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1480
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:264

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4068

C:\Users\Admin\AppData\Local\Temp\taskhostw.exe
C:\Users\Admin\AppData\Local\Temp\taskhostw.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:4244

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qe4f0nz5.zv3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\taskhostw.exe

Filesize
476KB

MD5
da604719663cbe3104a8e962b6e0c1a4

SHA1
e0ce2c871f1d20623c328fb16d7adbb4277f011f

SHA256
76633ce92246c62bb3df63286aa65e0efb5e6e4bc5bb5f5cf3bdbbc6514c988f

SHA512
847c1916b35f53a0c5d7afd9770863ed3789eb2468cb3dfdc343e8c61baacbd4679d676c8de79ebe72d38c905922d2f2a958603cd53bc921aece803d9823a287

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA7B.tmp.bat

Filesize
215B

MD5
73a6d1786c096749153008fb81be7f59

SHA1
5dc0da28acf6c85195caa3f3e6e53e5f13615b61

SHA256
9fb4d74e8e2feaa7b76f4cb21ebd707833e5193db35c62c0a9e2769c9f8f0a45

SHA512
b7f55a2dfbfe7b015381c9880c3ac96dc4cc2d98fea1c844350fc0c228532e5b9348a443570476a7c508af8619d368b458e7a910065522b974327d1f9b5aa92c

Download Submit
memory/716-1-0x0000000000740000-0x00000000007BE000-memory.dmp

Filesize
504KB

Download
memory/716-2-0x00007FFCC0723000-0x00007FFCC0725000-memory.dmp

Filesize
8KB

Download
memory/716-33-0x00007FFCC0720000-0x00007FFCC11E1000-memory.dmp

Filesize
10.8MB

Download
memory/716-0-0x00007FFCC0723000-0x00007FFCC0725000-memory.dmp

Filesize
8KB

Download
memory/716-40-0x00007FFCC0720000-0x00007FFCC11E1000-memory.dmp

Filesize
10.8MB

Download
memory/4244-41-0x00000000031A0000-0x00000000031EE000-memory.dmp

Filesize
312KB

Download
memory/4244-42-0x000000001BC40000-0x000000001BC52000-memory.dmp

Filesize
72KB

Download
memory/4244-43-0x000000001BCA0000-0x000000001BCDC000-memory.dmp

Filesize
240KB

Download
memory/4404-14-0x00007FFCC0720000-0x00007FFCC11E1000-memory.dmp

Filesize
10.8MB

Download
memory/4404-15-0x00007FFCC0720000-0x00007FFCC11E1000-memory.dmp

Filesize
10.8MB

Download
memory/4404-18-0x00007FFCC0720000-0x00007FFCC11E1000-memory.dmp

Filesize
10.8MB

Download
memory/4404-3-0x0000023FFAE10000-0x0000023FFAE32000-memory.dmp

Filesize
136KB

Download
memory/4404-13-0x00007FFCC0720000-0x00007FFCC11E1000-memory.dmp

Filesize
10.8MB

Download

Analysis

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