quasar | b01844fd95ecc51c681f238a6351fe1e8d7228b931f4324b023c4598907e9c69

General

Target

Client-be3uilt.exe
Size

1.9MB
MD5

f6f414c145d0acecfdd3cfba707386d3
SHA1

b7281f8c899da4fd46e814ccadda4b3f03db365f
SHA256

b01844fd95ecc51c681f238a6351fe1e8d7228b931f4324b023c4598907e9c69
SHA512

68ac467e9c57fe6c2108217393e1ba45b48503d5274565460420e508e0add220c69120bd5551d7741996f20011a9d1e33f327d13cbff8f29223d6fce6d2a0d24
SSDEEP

24576:Y1JFoVGS2eWBRwRR16zhHIPbcNK0KKm77yviUSQaZaOwI55l2S62r9exnjUDB3u9:Y7FB7wR2EgKKm77LrwCB6T

Score

10^/10

quasar spyware trojan

Malware Config

Extracted

Family

quasar

C2

Attributes

encryption_key
43EB246F63BA6C5E8F1B8F576653410351E57F4E
reconnect_delay
3000
startup_key
�� 8}pQ��C��ʷu��

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/5548-1-0x0000016CC4E40000-0x0000016CC502C000-memory.dmp	family_quasar
behavioral2/files/0x001a00000002b034-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3300	OfficeDirectory03.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\OfficeDirectory03.exe	Client-be3uilt.exe
File opened for modification	C:\Windows\system32\SubDir\OfficeDirectory03.exe	Client-be3uilt.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
2784	schtasks.exe
6084	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3300	OfficeDirectory03.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5548	Client-be3uilt.exe
Token: SeDebugPrivilege	3300	OfficeDirectory03.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3300	OfficeDirectory03.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5548 wrote to memory of 2784	5548	Client-be3uilt.exe	78
PID 5548 wrote to memory of 2784	5548	Client-be3uilt.exe	78
PID 5548 wrote to memory of 3300	5548	Client-be3uilt.exe	80
PID 5548 wrote to memory of 3300	5548	Client-be3uilt.exe	80
PID 3300 wrote to memory of 6084	3300	OfficeDirectory03.exe	81
PID 3300 wrote to memory of 6084	3300	OfficeDirectory03.exe	81

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-be3uilt.exe
"C:\Users\Admin\AppData\Local\Temp\Client-be3uilt.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5548
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Security Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\OfficeDirectory03.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2784
- C:\Windows\system32\SubDir\OfficeDirectory03.exe
  "C:\Windows\system32\SubDir\OfficeDirectory03.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3300
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Security Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\OfficeDirectory03.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:6084

Network

MITRE ATT&CK Enterprise v16

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:\Windows\System32\SubDir\OfficeDirectory03.exe

Filesize
1.9MB

MD5
f6f414c145d0acecfdd3cfba707386d3

SHA1
b7281f8c899da4fd46e814ccadda4b3f03db365f

SHA256
b01844fd95ecc51c681f238a6351fe1e8d7228b931f4324b023c4598907e9c69

SHA512
68ac467e9c57fe6c2108217393e1ba45b48503d5274565460420e508e0add220c69120bd5551d7741996f20011a9d1e33f327d13cbff8f29223d6fce6d2a0d24

Download Submit
memory/3300-14-0x000001C83A240000-0x000001C83A290000-memory.dmp

Filesize
320KB

Download
memory/3300-12-0x000001C839F60000-0x000001C839F72000-memory.dmp

Filesize
72KB

Download
memory/3300-21-0x00007FFEF8E50000-0x00007FFEF9912000-memory.dmp

Filesize
10.8MB

Download
memory/3300-20-0x00007FFEF8E50000-0x00007FFEF9912000-memory.dmp

Filesize
10.8MB

Download
memory/3300-17-0x000001C83A290000-0x000001C83A2DC000-memory.dmp

Filesize
304KB

Download
memory/3300-10-0x00007FFEF8E50000-0x00007FFEF9912000-memory.dmp

Filesize
10.8MB

Download
memory/3300-11-0x00007FFEF8E50000-0x00007FFEF9912000-memory.dmp

Filesize
10.8MB

Download
memory/3300-18-0x000001C83A2E0000-0x000001C83A32A000-memory.dmp

Filesize
296KB

Download
memory/3300-19-0x000001C839FB0000-0x000001C839FDA000-memory.dmp

Filesize
168KB

Download
memory/3300-15-0x000001C83A350000-0x000001C83A402000-memory.dmp

Filesize
712KB

Download
memory/3300-13-0x000001C839F70000-0x000001C839FAA000-memory.dmp

Filesize
232KB

Download
memory/3300-16-0x000001C83A1F0000-0x000001C83A23E000-memory.dmp

Filesize
312KB

Download
memory/5548-2-0x0000016CC6C10000-0x0000016CC6C2A000-memory.dmp

Filesize
104KB

Download
memory/5548-0-0x00007FFEF8E53000-0x00007FFEF8E55000-memory.dmp

Filesize
8KB

Download
memory/5548-9-0x00007FFEF8E50000-0x00007FFEF9912000-memory.dmp

Filesize
10.8MB

Download
memory/5548-1-0x0000016CC4E40000-0x0000016CC502C000-memory.dmp

Filesize
1.9MB

Download
memory/5548-3-0x00007FFEF8E50000-0x00007FFEF9912000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads