quasar | 83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730

General

Target

83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe
Size

3.1MB
MD5

d228d9c94c9e9b9e94bcaab2f8711fa8
SHA1

6b4800ef23217ff864ad59ee401c63535a35766a
SHA256

83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730
SHA512

6c74e6dae4f6bcc7604f13f5a7a694b719481c4e82b42092ccc99747f45975789f0b671a1425fa1156dc3ba14d26d21f0e00d3be939c9601c2a3b1e2d27131a4
SSDEEP

49152:Svkt62XlaSFNWPjljiFa2RoUYI8jY+1J/woGdGAFTHHB72eh2NT:Sv462XlaSFNWPjljiFXRoUYI8jYF

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.43.241:4782

Mutex

0517af80-95f0-4a6d-a904-5b7ee8faa157

Attributes

encryption_key
6095BF6D5D58D02597F98370DFD1CCEB782F1EDD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
svhost
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
behavioral1/memory/2904-1-0x0000000000B00000-0x0000000000E24000-memory.dmp	family_quasar
behavioral1/files/0x0014000000016fc9-6.dat	family_quasar
behavioral1/memory/2980-9-0x0000000000E30000-0x0000000001154000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2980	Client.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
2276	schtasks.exe
3028	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe
Token: SeDebugPrivilege	2980	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2980	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2904 wrote to memory of 2276	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	29
PID 2904 wrote to memory of 2276	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	29
PID 2904 wrote to memory of 2276	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	29
PID 2904 wrote to memory of 2980	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	31
PID 2904 wrote to memory of 2980	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	31
PID 2904 wrote to memory of 2980	2904	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	31
PID 2980 wrote to memory of 3028	2980	Client.exe	32
PID 2980 wrote to memory of 3028	2980	Client.exe	32
PID 2980 wrote to memory of 3028	2980	Client.exe	32

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\83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe
"C:\Users\Admin\AppData\Local\Temp\83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2904
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2276
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2980
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3028

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
d228d9c94c9e9b9e94bcaab2f8711fa8

SHA1
6b4800ef23217ff864ad59ee401c63535a35766a

SHA256
83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730

SHA512
6c74e6dae4f6bcc7604f13f5a7a694b719481c4e82b42092ccc99747f45975789f0b671a1425fa1156dc3ba14d26d21f0e00d3be939c9601c2a3b1e2d27131a4

Download Submit
memory/2904-0-0x000007FEF5F03000-0x000007FEF5F04000-memory.dmp

Filesize
4KB

Download
memory/2904-1-0x0000000000B00000-0x0000000000E24000-memory.dmp

Filesize
3.1MB

Download
memory/2904-2-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download
memory/2904-10-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download
memory/2980-8-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download
memory/2980-9-0x0000000000E30000-0x0000000001154000-memory.dmp

Filesize
3.1MB

Download
memory/2980-11-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download
memory/2980-12-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads