quasar | 4146288cd858e72cc246c03bae1cf61494a575366c4e0e86f7c824455b938388

General

Target

AdobePDFReader.exe
Size

3.4MB
MD5

9d6f812bb326e1ff2bddd78747fbee25
SHA1

e2c511d7634e02166a3ca7645b631e124767e216
SHA256

4146288cd858e72cc246c03bae1cf61494a575366c4e0e86f7c824455b938388
SHA512

12783e33c8d3a0bb0d284e300158155aa52c9a44635565a8bc53dbfcd0ff976d32983cae732e07ed207ad5bb0283ba23a88f2d426781fcbd16e8dd1b72508191
SSDEEP

49152:wvmlW2p9agXI2PrlTnr4BZmFze02sk9hEvJQLoGdhTHHB72eh2NT:wveW2p9agXI2PrlTnrmZmFzePhD

Score

10^/10

quasar pdf spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

PDF

C2

opbrghost-23030.portmap.host:27876

ghostopbr2-31034.portmap.host:1234

trackopbr2.ddns.net:1234

ghostopbr2-31034.portmap.host:31034

Mutex

1bfd6271-eb49-4e9c-8bcb-3434a8d1ce46

Attributes

encryption_key
15ABC767973F155DA890D96E8ED7EB1946705743
install_name
AdobePDFReader.exe
log_directory
Logs
reconnect_delay
300
startup_key
Adobe PDF Reader
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/2596-1-0x0000000000270000-0x00000000005D6000-memory.dmp	family_quasar
behavioral1/files/0x0031000000018bbf-6.dat	family_quasar
behavioral1/memory/2952-9-0x00000000001B0000-0x0000000000516000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2952	AdobePDFReader.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\AdobePDFReader.exe	AdobePDFReader.exe
File opened for modification	C:\Windows\system32\SubDir\AdobePDFReader.exe	AdobePDFReader.exe
File opened for modification	C:\Windows\system32\SubDir	AdobePDFReader.exe
File opened for modification	C:\Windows\system32\SubDir\AdobePDFReader.exe	AdobePDFReader.exe
File opened for modification	C:\Windows\system32\SubDir	AdobePDFReader.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
2968	schtasks.exe
2096	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2596	AdobePDFReader.exe
Token: SeDebugPrivilege	2952	AdobePDFReader.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2952	AdobePDFReader.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2596 wrote to memory of 2968	2596	AdobePDFReader.exe	30
PID 2596 wrote to memory of 2968	2596	AdobePDFReader.exe	30
PID 2596 wrote to memory of 2968	2596	AdobePDFReader.exe	30
PID 2596 wrote to memory of 2952	2596	AdobePDFReader.exe	32
PID 2596 wrote to memory of 2952	2596	AdobePDFReader.exe	32
PID 2596 wrote to memory of 2952	2596	AdobePDFReader.exe	32
PID 2952 wrote to memory of 2096	2952	AdobePDFReader.exe	33
PID 2952 wrote to memory of 2096	2952	AdobePDFReader.exe	33
PID 2952 wrote to memory of 2096	2952	AdobePDFReader.exe	33

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\AdobePDFReader.exe
"C:\Users\Admin\AppData\Local\Temp\AdobePDFReader.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2596
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Adobe PDF Reader" /sc ONLOGON /tr "C:\Windows\system32\SubDir\AdobePDFReader.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2968
- C:\Windows\system32\SubDir\AdobePDFReader.exe
  "C:\Windows\system32\SubDir\AdobePDFReader.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2952
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Adobe PDF Reader" /sc ONLOGON /tr "C:\Windows\system32\SubDir\AdobePDFReader.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2096

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:\Windows\System32\SubDir\AdobePDFReader.exe

Filesize
3.4MB

MD5
9d6f812bb326e1ff2bddd78747fbee25

SHA1
e2c511d7634e02166a3ca7645b631e124767e216

SHA256
4146288cd858e72cc246c03bae1cf61494a575366c4e0e86f7c824455b938388

SHA512
12783e33c8d3a0bb0d284e300158155aa52c9a44635565a8bc53dbfcd0ff976d32983cae732e07ed207ad5bb0283ba23a88f2d426781fcbd16e8dd1b72508191

Download Submit
memory/2596-0-0x000007FEF5B13000-0x000007FEF5B14000-memory.dmp

Filesize
4KB

Download
memory/2596-1-0x0000000000270000-0x00000000005D6000-memory.dmp

Filesize
3.4MB

Download
memory/2596-2-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2596-8-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2952-9-0x00000000001B0000-0x0000000000516000-memory.dmp

Filesize
3.4MB

Download
memory/2952-11-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2952-10-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2952-12-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2952-13-0x000007FEF5B10000-0x000007FEF64FC000-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