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 2 IoCs

resource	yara_rule
behavioral2/memory/1768-1-0x0000000000050000-0x00000000003B6000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b8f-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
408	AdobePDFReader.exe

Drops file in System32 directory 5 IoCs

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

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
2220	schtasks.exe
1456	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1768	AdobePDFReader.exe
Token: SeDebugPrivilege	408	AdobePDFReader.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
408	AdobePDFReader.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1768 wrote to memory of 2220	1768	AdobePDFReader.exe	83
PID 1768 wrote to memory of 2220	1768	AdobePDFReader.exe	83
PID 1768 wrote to memory of 408	1768	AdobePDFReader.exe	85
PID 1768 wrote to memory of 408	1768	AdobePDFReader.exe	85
PID 408 wrote to memory of 1456	408	AdobePDFReader.exe	86
PID 408 wrote to memory of 1456	408	AdobePDFReader.exe	86

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:1768
- 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:2220
- 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:408
- - 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:1456

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\Local\Microsoft\CLR_v4.0\UsageLogs\AdobePDFReader.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Windows\System32\SubDir\AdobePDFReader.exe

Filesize
3.4MB

MD5
9d6f812bb326e1ff2bddd78747fbee25

SHA1
e2c511d7634e02166a3ca7645b631e124767e216

SHA256
4146288cd858e72cc246c03bae1cf61494a575366c4e0e86f7c824455b938388

SHA512
12783e33c8d3a0bb0d284e300158155aa52c9a44635565a8bc53dbfcd0ff976d32983cae732e07ed207ad5bb0283ba23a88f2d426781fcbd16e8dd1b72508191

Download Submit
memory/408-11-0x00007FFA210C0000-0x00007FFA21B81000-memory.dmp

Filesize
10.8MB

Download
memory/408-12-0x00007FFA210C0000-0x00007FFA21B81000-memory.dmp

Filesize
10.8MB

Download
memory/408-13-0x000000001B7F0000-0x000000001B840000-memory.dmp

Filesize
320KB

Download
memory/408-14-0x000000001B900000-0x000000001B9B2000-memory.dmp

Filesize
712KB

Download
memory/408-15-0x00007FFA210C0000-0x00007FFA21B81000-memory.dmp

Filesize
10.8MB

Download
memory/408-16-0x00007FFA210C0000-0x00007FFA21B81000-memory.dmp

Filesize
10.8MB

Download
memory/1768-0-0x00007FFA210C3000-0x00007FFA210C5000-memory.dmp

Filesize
8KB

Download
memory/1768-1-0x0000000000050000-0x00000000003B6000-memory.dmp

Filesize
3.4MB

Download
memory/1768-2-0x00007FFA210C0000-0x00007FFA21B81000-memory.dmp

Filesize
10.8MB

Download
memory/1768-10-0x00007FFA210C0000-0x00007FFA21B81000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads