quasar | 505ea567d35277947cfaaaf37e16abdf782ada70992f2ff696c37c212f66aae3

General

Target

Client-built.exe
Size

1.9MB
MD5

46e15951b8bcf47690ab6aea44fe989f
SHA1

89223807bb1e72cbd49599636734b2f93beda276
SHA256

505ea567d35277947cfaaaf37e16abdf782ada70992f2ff696c37c212f66aae3
SHA512

118a2fe1140ae54f5abfbc60b1f3a9f548f276a05130afcedba51c0f85af9df3e91e6f6557ac857571772b9c0780fe6d78925bed7ec8bfab185aa94a031717ae
SSDEEP

24576:Y1JFopYS2eWBRwRR16zhHIPbcNK0KKm77yviUSQaZaOwI55l2S62r9exnsDtR9:Y7F37wR2EgKKm77LrwCB6Tc

Score

10^/10

quasar spyware trojan

Malware Config

Extracted

Family

quasar

Attributes

encryption_key
43EB246F63BA6C5E8F1B8F576653410351E57F4E
reconnect_delay
3000

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/2204-1-0x000001EF87E90000-0x000001EF8807C000-memory.dmp	family_quasar
behavioral1/files/0x00070000000242ea-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
100	OfficeDirectory03.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\OfficeDirectory03.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\OfficeDirectory03.exe	Client-built.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
2696	schtasks.exe
440	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
100	OfficeDirectory03.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2204	Client-built.exe
Token: SeDebugPrivilege	100	OfficeDirectory03.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
100	OfficeDirectory03.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2204 wrote to memory of 2696	2204	Client-built.exe	91
PID 2204 wrote to memory of 2696	2204	Client-built.exe	91
PID 2204 wrote to memory of 100	2204	Client-built.exe	93
PID 2204 wrote to memory of 100	2204	Client-built.exe	93
PID 100 wrote to memory of 440	100	OfficeDirectory03.exe	94
PID 100 wrote to memory of 440	100	OfficeDirectory03.exe	94

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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2204
- 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:2696
- 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:100
- - 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:440

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
46e15951b8bcf47690ab6aea44fe989f

SHA1
89223807bb1e72cbd49599636734b2f93beda276

SHA256
505ea567d35277947cfaaaf37e16abdf782ada70992f2ff696c37c212f66aae3

SHA512
118a2fe1140ae54f5abfbc60b1f3a9f548f276a05130afcedba51c0f85af9df3e91e6f6557ac857571772b9c0780fe6d78925bed7ec8bfab185aa94a031717ae

Download Submit
memory/100-14-0x000002052E810000-0x000002052E860000-memory.dmp

Filesize
320KB

Download
memory/100-15-0x000002052E920000-0x000002052E9D2000-memory.dmp

Filesize
712KB

Download
memory/100-21-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/100-20-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/100-19-0x000002052E9E0000-0x000002052EA0A000-memory.dmp

Filesize
168KB

Download
memory/100-10-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/100-11-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/100-18-0x000002052E8B0000-0x000002052E8FA000-memory.dmp

Filesize
296KB

Download
memory/100-17-0x000002052E860000-0x000002052E8AC000-memory.dmp

Filesize
304KB

Download
memory/100-12-0x0000020515BB0000-0x0000020515BC2000-memory.dmp

Filesize
72KB

Download
memory/100-13-0x000002052E780000-0x000002052E7BA000-memory.dmp

Filesize
232KB

Download
memory/100-16-0x000002052E7C0000-0x000002052E80E000-memory.dmp

Filesize
312KB

Download
memory/2204-2-0x000001EF88450000-0x000001EF8846A000-memory.dmp

Filesize
104KB

Download
memory/2204-0-0x00007FFB7B243000-0x00007FFB7B245000-memory.dmp

Filesize
8KB

Download
memory/2204-9-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/2204-1-0x000001EF87E90000-0x000001EF8807C000-memory.dmp

Filesize
1.9MB

Download
memory/2204-3-0x00007FFB7B240000-0x00007FFB7BD01000-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