quasar | cc4491424f6fb4a714bc0ac6471ea3ed5e40f0bd6d452e79198781faa643359a

Analysis

max time kernel
142s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
01/03/2024, 17:09

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General

Target
Client-built.exe
Size 3.1MB
Sample240301-vn8p8aaf77
SHA256 cc4491424f6fb4a714bc0ac6471ea3ed5e40f0bd6d452e79198781faa643359a
MD5 fa76cd3af1a4f5231be967e21ff128ce
SHA1 d1dfb2e5da218bb1ae383178399601b8ba2605a4
SHA512 80d63d229a44c346d721dde1ab213cebf7f8e1ee4b0cf07e2e37b3fba4ef0fcb5dabea18aab5deba7a35eccbf0c8f287f76ef9f6fba63fd54d4193091232d541
SSDEEP 49152:Dvst62XlaSFNWPjljiFa2RoUYIT4FwY7vlvAk/PQoGdkzTHHB72eh2NT:DvQ62XlaSFNWPjljiFXRoUYITHYSU
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.56.1:4782

Mutex

4b954fab-7429-499a-ab6b-df9c5e3096d7

Attributes

encryption_key
D75601A171551C23C0EEACEE58E7D707A2C948C8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
TestWindows
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/4448-0-0x0000000000D50000-0x0000000001074000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023266-5.dat	family_quasar
behavioral2/files/0x0007000000023266-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
400	Client.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2900	schtasks.exe
2976	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4448	Client-built.exe
Token: SeDebugPrivilege	400	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
400	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
400	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4448 wrote to memory of 2900	4448	Client-built.exe	96
PID 4448 wrote to memory of 2900	4448	Client-built.exe	96
PID 4448 wrote to memory of 400	4448	Client-built.exe	98
PID 4448 wrote to memory of 400	4448	Client-built.exe	98
PID 400 wrote to memory of 2976	400	Client.exe	101
PID 400 wrote to memory of 2976	400	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4448
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "TestWindows" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2900
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:400
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "TestWindows" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2976

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 --no-appcompat-clear --mojo-platform-channel-handle=1328 --field-trial-handle=3060,i,1774866140584649235,8085848018931772189,262144 --variations-seed-version /prefetch:8
1⤵
PID:4160

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 2.2MB
SHA256 b0b7fa2c12cd9a38d66ef411cc73221ab5c951395e0e8e8cb2317c91fbb2a634
MD5 5d718e57e2efdc176d96dcc2b00edf46
SHA1 2e8bb35265faea0b8fe56a8eb1fa600fd59f96bc
SHA512 397bd6646193829e0822d281bdca5a01ef4ab0c7f5efd7be685be0502f7b2984d67629dc6de3fc561fecdffa24145e5fa1e13c4aeeaeaa85feab703761524460
SSDEEP 49152:Dvst62XlaSFNWPjljiFa2RoUYIT4FwY7vlvO:DvQ62XlaSFNWPjljiFXRoUYITHYQ
MD5 SHA1 SHA512 SSDEEP

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Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 2.2MB
SHA256 99f7a436331fd84b264b3a9359830baf5bc7f5cf130c94cac6e8397c90f4337a
MD5 b811546a9a8600119195b81852fdf692
SHA1 43b70d90f182b8d99fb885b125ed5a669d2c1ff5
SHA512 f90e82fb2a2d5044b97ea429026e4fd55de2704c4bd0b9aa5472ceb852ca2c65da31cb56959a6c765cc95f499731f2ad61a5d1ede20fbdfe8ff8b8b460d0f5b6
SSDEEP 49152:Dvst62XlaSFNWPjljiFa2RoUYIT4FwY7vlvU:DvQ62XlaSFNWPjljiFXRoUYITHYS
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/400-8-0x00007FFA36210000-0x00007FFA36CD1000-memory.dmp

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memory/400-10-0x000000001BE20000-0x000000001BE30000-memory.dmp

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memory/400-11-0x000000001C9D0000-0x000000001CA20000-memory.dmp

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memory/400-12-0x000000001CAE0000-0x000000001CB92000-memory.dmp

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memory/400-13-0x00007FFA36210000-0x00007FFA36CD1000-memory.dmp

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memory/400-14-0x000000001BE20000-0x000000001BE30000-memory.dmp

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memory/4448-0-0x0000000000D50000-0x0000000001074000-memory.dmp

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memory/4448-1-0x00007FFA36210000-0x00007FFA36CD1000-memory.dmp

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memory/4448-2-0x000000001BD00000-0x000000001BD10000-memory.dmp

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memory/4448-9-0x00007FFA36210000-0x00007FFA36CD1000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads