quasar | 481007a4671675242a7b0bf2d667f571427d07e7744938f33b89efa5d2a9a110

Analysis

max time kernel
131s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20240704-en
resource tags

arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
submitted
05/07/2024, 01:29

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General

Target
Tropical.exe
Size 3.1MB
Sample240705-bwf6dsygpr
SHA256 481007a4671675242a7b0bf2d667f571427d07e7744938f33b89efa5d2a9a110
MD5 b1860096a91bc57af31a3654907a6aba
SHA1 175916f51666ab8bb9657496af8131d288957efc
SHA512 fc864dae0aa9721be76a0e56209bcf3953107281cba35027afe7f4631eb8d3add5ef631686de59c1332d0cab48340cc126dff54350def01f590b8f70f6672c81
SSDEEP 49152:KvyI22SsaNYfdPBldt698dBcjHdYMH1J39oGd3THHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHdYMF
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.12.159:4782

Mutex

e7681a82-0c73-45db-8f14-02384106776c

Attributes

encryption_key
A995015D498D0D044BFA399C3B0A5E7C3DF9157D
install_name
Tropical.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Tropical Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/3856-1-0x00000000004F0000-0x0000000000814000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023611-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1552	Tropical.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
3416	schtasks.exe
3960	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3856	Tropical.exe
Token: SeDebugPrivilege	1552	Tropical.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1552	Tropical.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3856 wrote to memory of 3416	3856	Tropical.exe	90
PID 3856 wrote to memory of 3416	3856	Tropical.exe	90
PID 3856 wrote to memory of 1552	3856	Tropical.exe	92
PID 3856 wrote to memory of 1552	3856	Tropical.exe	92
PID 1552 wrote to memory of 3960	1552	Tropical.exe	94
PID 1552 wrote to memory of 3960	1552	Tropical.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\Tropical.exe
"C:\Users\Admin\AppData\Local\Temp\Tropical.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3856
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Tropical Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Tropical.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3416
- C:\Users\Admin\AppData\Roaming\SubDir\Tropical.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Tropical.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1552
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Tropical Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Tropical.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3960

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3852,i,7761714625659357865,10802238739796857379,262144 --variations-seed-version --mojo-platform-channel-handle=3828 /prefetch:8
1⤵
PID:2628

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Tropical.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Tropical.exe.log
Size 1KB
SHA256 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
MD5 baf55b95da4a601229647f25dad12878
SHA1 abc16954ebfd213733c4493fc1910164d825cac8
SHA512 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
MD5 SHA1 SHA512

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Tropical.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Tropical.exe
Size 3.1MB
SHA256 481007a4671675242a7b0bf2d667f571427d07e7744938f33b89efa5d2a9a110
MD5 b1860096a91bc57af31a3654907a6aba
SHA1 175916f51666ab8bb9657496af8131d288957efc
SHA512 fc864dae0aa9721be76a0e56209bcf3953107281cba35027afe7f4631eb8d3add5ef631686de59c1332d0cab48340cc126dff54350def01f590b8f70f6672c81
SSDEEP 49152:KvyI22SsaNYfdPBldt698dBcjHdYMH1J39oGd3THHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHdYMF
MD5 SHA1 SHA512 SSDEEP

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memory/1552-10-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

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memory/1552-12-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

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memory/1552-13-0x000000001B7D0000-0x000000001B820000-memory.dmp

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memory/1552-14-0x000000001B8E0000-0x000000001B992000-memory.dmp

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memory/1552-15-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

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memory/3856-0-0x00007FFE64353000-0x00007FFE64355000-memory.dmp

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memory/3856-1-0x00000000004F0000-0x0000000000814000-memory.dmp

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memory/3856-2-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

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memory/3856-11-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads