quasar | 9365b6cee47eecc6eab2c6d138f0d5714c31ff1473143ce14ce874eb896f01b3

General

Target

0x000600000001946e-14.exe
Size

556KB
MD5

85410a49050c880d856c15b4c958d86d
SHA1

f520f25b5cd537b1060d8ca66f53bac745f8f8fa
SHA256

9365b6cee47eecc6eab2c6d138f0d5714c31ff1473143ce14ce874eb896f01b3
SHA512

94ac76b3fb61b14f39b9cc9848d530842c834ae32efede2da7c5ce3d062940a788391d7b22e888ec5b024dba7437ef043ee11554fe62509e1f71ee202791f7d5
SSDEEP

12288:QusTy3x2mUEiLYStKT7yFPb2bNRZGU6rCUk:Qq3nUIStKHIPbcNREo

Score

10^/10

quasar office04 discovery execution spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.5.0

Botnet

Office04

C2

movies-concerning.gl.at.ply.gg:12712

Mutex

5f7b0195-4eaf-4ae9-b4f8-cc2f6f6c4eb3

Attributes

encryption_key
27AAC11A05508545506D258070495FCDA9A82735
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Modded Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/5644-1-0x000002426FE60000-0x000002426FEF0000-memory.dmp	family_quasar
behavioral2/memory/5644-2-0x0000024270290000-0x00000242702A8000-memory.dmp	family_quasar
behavioral2/files/0x000800000002426c-6.dat	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

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

execution

PowerShell

T1059.001

pid	Process
3948	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-1-5-21-3975168204-1612096350-4002976354-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
4676	Client.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\Recovery	reagentc.exe
File opened for modification	C:\Windows\system32\Recovery\ReAgent.xml	reagentc.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Logs\ReAgent\ReAgent.log	reagentc.exe
File opened for modification	C:\Windows\Panther\UnattendGC\setuperr.log	reagentc.exe
File opened for modification	C:\Windows\Panther\UnattendGC\diagerr.xml	reagentc.exe
File opened for modification	C:\Windows\Panther\UnattendGC\diagwrn.xml	reagentc.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

pid	Process
5084	schtasks.exe
4036	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4676	Client.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
3948	powershell.exe
3948	powershell.exe
4676	Client.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5644	0x000600000001946e-14.exe
Token: SeDebugPrivilege	4676	Client.exe
Token: SeDebugPrivilege	3948	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2764	conhost.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5644 wrote to memory of 5084	5644	0x000600000001946e-14.exe	89
PID 5644 wrote to memory of 5084	5644	0x000600000001946e-14.exe	89
PID 5644 wrote to memory of 4676	5644	0x000600000001946e-14.exe	91
PID 5644 wrote to memory of 4676	5644	0x000600000001946e-14.exe	91
PID 4676 wrote to memory of 4036	4676	Client.exe	92
PID 4676 wrote to memory of 4036	4676	Client.exe	92
PID 4676 wrote to memory of 2764	4676	Client.exe	99
PID 4676 wrote to memory of 2764	4676	Client.exe	99
PID 4676 wrote to memory of 3948	4676	Client.exe	101
PID 2764 wrote to memory of 4344	2764	conhost.exe	100
PID 2764 wrote to memory of 4344	2764	conhost.exe	100
PID 4676 wrote to memory of 3948	4676	Client.exe	101

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

C:\Users\Admin\AppData\Local\Temp\0x000600000001946e-14.exe
"C:\Users\Admin\AppData\Local\Temp\0x000600000001946e-14.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5644
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Modded Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5084
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4676
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Modded Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4036
- - C:\Windows\System32\conhost.exe
    "C:\Windows\System32\conhost.exe" reagentc /disable
    3⤵
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2764
  - - C:\Windows\System32\reagentc.exe
      reagentc /disable
      4⤵
      Drops file in System32 directory
      Drops file in Windows directory
      PID:4344
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "$([System.Environment]::GetEnvironmentVariable('SystemDrive'))\"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3948

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Browser Information Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gh5ssghj.ifn.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
556KB

MD5
85410a49050c880d856c15b4c958d86d

SHA1
f520f25b5cd537b1060d8ca66f53bac745f8f8fa

SHA256
9365b6cee47eecc6eab2c6d138f0d5714c31ff1473143ce14ce874eb896f01b3

SHA512
94ac76b3fb61b14f39b9cc9848d530842c834ae32efede2da7c5ce3d062940a788391d7b22e888ec5b024dba7437ef043ee11554fe62509e1f71ee202791f7d5

Download Submit
memory/3948-23-0x000002ABC1450000-0x000002ABC1472000-memory.dmp

Filesize
136KB

Download
memory/4676-12-0x00000228D0690000-0x00000228D06E0000-memory.dmp

Filesize
320KB

Download
memory/4676-14-0x00000228D05F0000-0x00000228D063E000-memory.dmp

Filesize
312KB

Download
memory/4676-9-0x00007FF965C80000-0x00007FF966741000-memory.dmp

Filesize
10.8MB

Download
memory/4676-37-0x00007FF965C80000-0x00007FF966741000-memory.dmp

Filesize
10.8MB

Download
memory/4676-11-0x00007FF965C80000-0x00007FF966741000-memory.dmp

Filesize
10.8MB

Download
memory/4676-36-0x00007FF965C80000-0x00007FF966741000-memory.dmp

Filesize
10.8MB

Download
memory/4676-13-0x00000228D08C0000-0x00000228D0972000-memory.dmp

Filesize
712KB

Download
memory/4676-19-0x00000228D0E30000-0x00000228D0E42000-memory.dmp

Filesize
72KB

Download
memory/4676-17-0x00000228D0840000-0x00000228D0852000-memory.dmp

Filesize
72KB

Download
memory/4676-18-0x00000228D0CC0000-0x00000228D0CFC000-memory.dmp

Filesize
240KB

Download
memory/5644-3-0x00007FF965C80000-0x00007FF966741000-memory.dmp

Filesize
10.8MB

Download
memory/5644-2-0x0000024270290000-0x00000242702A8000-memory.dmp

Filesize
96KB

Download
memory/5644-1-0x000002426FE60000-0x000002426FEF0000-memory.dmp

Filesize
576KB

Download
memory/5644-0-0x00007FF965C83000-0x00007FF965C85000-memory.dmp

Filesize
8KB

Download
memory/5644-10-0x00007FF965C80000-0x00007FF966741000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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