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
behavioral1/memory/5564-1-0x00000255DE770000-0x00000255DE95C000-memory.dmp	family_quasar
behavioral1/files/0x00070000000241be-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1736	OfficeDirectory03.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\OfficeDirectory03.exe	Client-be3uilt.exe
File created	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
5148	schtasks.exe
4416	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1736	OfficeDirectory03.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5564	Client-be3uilt.exe
Token: SeDebugPrivilege	1736	OfficeDirectory03.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1736	OfficeDirectory03.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5564 wrote to memory of 5148	5564	Client-be3uilt.exe	87
PID 5564 wrote to memory of 5148	5564	Client-be3uilt.exe	87
PID 5564 wrote to memory of 1736	5564	Client-be3uilt.exe	89
PID 5564 wrote to memory of 1736	5564	Client-be3uilt.exe	89
PID 1736 wrote to memory of 4416	1736	OfficeDirectory03.exe	91
PID 1736 wrote to memory of 4416	1736	OfficeDirectory03.exe	91

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:5564
- 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:5148
- 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:1736
- - 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:4416

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/1736-12-0x000002EBB7910000-0x000002EBB7922000-memory.dmp

Filesize
72KB

Download
memory/1736-18-0x000002EBD03B0000-0x000002EBD03FA000-memory.dmp

Filesize
296KB

Download
memory/1736-21-0x00007FFF92EA0000-0x00007FFF93961000-memory.dmp

Filesize
10.8MB

Download
memory/1736-20-0x00007FFF92EA0000-0x00007FFF93961000-memory.dmp

Filesize
10.8MB

Download
memory/1736-9-0x00007FFF92EA0000-0x00007FFF93961000-memory.dmp

Filesize
10.8MB

Download
memory/1736-17-0x000002EBD0360000-0x000002EBD03AC000-memory.dmp

Filesize
304KB

Download
memory/1736-11-0x00007FFF92EA0000-0x00007FFF93961000-memory.dmp

Filesize
10.8MB

Download
memory/1736-16-0x000002EBD02C0000-0x000002EBD030E000-memory.dmp

Filesize
312KB

Download
memory/1736-19-0x000002EBD0270000-0x000002EBD029A000-memory.dmp

Filesize
168KB

Download
memory/1736-15-0x000002EBD0420000-0x000002EBD04D2000-memory.dmp

Filesize
712KB

Download
memory/1736-14-0x000002EBD0310000-0x000002EBD0360000-memory.dmp

Filesize
320KB

Download
memory/1736-13-0x000002EBD0230000-0x000002EBD026A000-memory.dmp

Filesize
232KB

Download
memory/5564-2-0x00000255DED30000-0x00000255DED4A000-memory.dmp

Filesize
104KB

Download
memory/5564-0-0x00007FFF92EA3000-0x00007FFF92EA5000-memory.dmp

Filesize
8KB

Download
memory/5564-10-0x00007FFF92EA0000-0x00007FFF93961000-memory.dmp

Filesize
10.8MB

Download
memory/5564-1-0x00000255DE770000-0x00000255DE95C000-memory.dmp

Filesize
1.9MB

Download
memory/5564-3-0x00007FFF92EA0000-0x00007FFF93961000-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