quasar | 21777e4669dff75edfc66f27387feebcced5bc94b44d9f37e9208bda7e5a4fa6

General

Target
Cos de reciclare.exe
Size 1.3MB
Sample240820-xtgj2asdmm
SHA256 21777e4669dff75edfc66f27387feebcced5bc94b44d9f37e9208bda7e5a4fa6
MD5 a99aa8bf65b87bb36d30067751efa1de
SHA1 665bbcd6658fb595442bba624c73e4daf82b4cc2
SHA512 0d210f49d39544b74f2c47831bb878e625aba9c256c8b6c1d54a0b1c9af29e8e4daa5b57e350221ac848b97eaa1d92a71b81d5c8b6a753ed6df330aa0888bd9c
SSDEEP 24576:SBkVdlYAW0O6ytHgyqfaMy2ISuqyPpOGM+4t9FpMkA0GqGjSL7jLmjU+RbHTnP3:2svfGNMyBOZ+qtA3ymjUGbH7P
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 discovery persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.100:4782

Mutex

5f24d4ac-28b9-439a-86bb-1a016ab7e122

Attributes

encryption_key
3962D5C610BB913B499DB1DA955E36C0925BE31B
install_name
python.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Driver Foundation - ...
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000a00000002353e-6.dat	family_quasar
behavioral2/memory/452-15-0x0000000000B30000-0x0000000000E54000-memory.dmp	family_quasar

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-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	Cos de reciclare.exe

Executes dropped EXE 2 IoCs

pid	Process
452	Client-built.exe
2056	python.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-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Driver Foundation - ... = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\python.exe\""	Client-built.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Driver Foundation - ... = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\python.exe\""	python.exe

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 1 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	Cos de reciclare.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

pid	Process
4820	schtasks.exe
2972	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	452	Client-built.exe
Token: SeDebugPrivilege	2056	python.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2056	python.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3208 wrote to memory of 452	3208	Cos de reciclare.exe	102
PID 3208 wrote to memory of 452	3208	Cos de reciclare.exe	102
PID 452 wrote to memory of 4820	452	Client-built.exe	104
PID 452 wrote to memory of 4820	452	Client-built.exe	104
PID 452 wrote to memory of 2056	452	Client-built.exe	106
PID 452 wrote to memory of 2056	452	Client-built.exe	106
PID 2056 wrote to memory of 2972	2056	python.exe	107
PID 2056 wrote to memory of 2972	2056	python.exe	107

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\Cos de reciclare.exe
"C:\Users\Admin\AppData\Local\Temp\Cos de reciclare.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3208
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:452
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Driver Foundation - ..." /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\python.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4820
- - C:\Users\Admin\AppData\Roaming\SubDir\python.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\python.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2056
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Driver Foundation - ..." /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\python.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2972

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3032,i,11251706013556949551,5157034131170452377,262144 --variations-seed-version --mojo-platform-channel-handle=4440 /prefetch:8
1⤵
PID:2052

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client-built.exe

Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe
Size 3.1MB
SHA256 de3e740b380e135cb7646dce38d33436c22ec517eedad1fc288b0cdebea81f3f
MD5 6fd326f64609cfa7aea52ecb7f9a1034
SHA1 fdca6177cc29e93a0e759df6b3c6c26a9a3a8592
SHA512 bc1e45668666ad3cd8203b3d437710d57655237319aee0a6972940a54a81c26a25ecd4f6c907415c5e931e14a46f2de8fb5008dd562ff4301e6aa598256204f5
SSDEEP 49152:OvyI22SsaNYfdPBldt698dBcjH2Kak9hRvJ/LoGdokdTHHB72eh2NT:Ovf22SsaNYfdPBldt6+dBcjHzh3
MD5 SHA1 SHA512 SSDEEP

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memory/452-14-0x00007FFD3B1D3000-0x00007FFD3B1D5000-memory.dmp

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memory/452-15-0x0000000000B30000-0x0000000000E54000-memory.dmp

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memory/452-16-0x00007FFD3B1D0000-0x00007FFD3BC91000-memory.dmp

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memory/452-23-0x00007FFD3B1D0000-0x00007FFD3BC91000-memory.dmp

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memory/2056-24-0x000000001BA10000-0x000000001BA60000-memory.dmp

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memory/2056-25-0x000000001BB20000-0x000000001BBD2000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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