quasar | 348d6ee5d14cba4dd47355c7c521bf085824359b0285fd0f769678dc8c4edcea

Analysis

max time kernel
18s
max time network
19s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
29-05-2024 04:47

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General

Target

Client-built.exe
Size

3.1MB
MD5

b5477d01c6ec3a2e05153673c7cba24a
SHA1

0774e7fb2a94aa489185ae7047b5c810685ba12e
SHA256

348d6ee5d14cba4dd47355c7c521bf085824359b0285fd0f769678dc8c4edcea
SHA512

590948c3b4e32685a6d4bbb14017c145f061f15e28d3ba1f26ef0d14a01adf2ab029fa11ee4ab2881612084b34e63f30d49d8867dcb0a463a848b6c253f8e488
SSDEEP

49152:WvRt62XlaSFNWPjljiFa2RoUYIFeRJ6abR3LoGdZKTHHB72eh2NT:Wvb62XlaSFNWPjljiFXRoUYIFeRJ60

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.0.235:4782

Mutex

344dfdd6-fe74-48a9-967b-a3dfad856bcb

Attributes

encryption_key
131452D2A8537CACD85316B57C663E06ADAC8DE0
install_name
SvcHost.exe
log_directory
Logs
reconnect_delay
3000
startup_key
conhost
subdirectory
Windows

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1968-1-0x0000000000950000-0x0000000000C74000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\Windows\SvcHost.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

SvcHost.exe

pid process

2960 SvcHost.exe
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1668 schtasks.exe
376 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeSvcHost.exe

description pid process

Token: SeDebugPrivilege 1968 Client-built.exe
Token: SeDebugPrivilege 2960 SvcHost.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

SvcHost.exe

pid process

2960 SvcHost.exe

pid	process
2960	SvcHost.exe

pid	process
1668	schtasks.exe
376	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1968	Client-built.exe
Token: SeDebugPrivilege	2960	SvcHost.exe

pid	process
2960	SvcHost.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeSvcHost.exe

description	pid	process	target process
PID 1968 wrote to memory of 1668	1968	Client-built.exe	schtasks.exe
PID 1968 wrote to memory of 1668	1968	Client-built.exe	schtasks.exe
PID 1968 wrote to memory of 2960	1968	Client-built.exe	SvcHost.exe
PID 1968 wrote to memory of 2960	1968	Client-built.exe	SvcHost.exe
PID 2960 wrote to memory of 376	2960	SvcHost.exe	schtasks.exe
PID 2960 wrote to memory of 376	2960	SvcHost.exe	schtasks.exe

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1968

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "conhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\SvcHost.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1668

C:\Users\Admin\AppData\Roaming\Windows\SvcHost.exe
"C:\Users\Admin\AppData\Roaming\Windows\SvcHost.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2960

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "conhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\SvcHost.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:376

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 --no-appcompat-clear --field-trial-handle=4168,i,13281073920029625837,8253721632651544158,262144 --variations-seed-version --mojo-platform-channel-handle=3984 /prefetch:8
1⤵
PID:2980

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Windows\SvcHost.exe

Filesize
3.1MB

MD5
b5477d01c6ec3a2e05153673c7cba24a

SHA1
0774e7fb2a94aa489185ae7047b5c810685ba12e

SHA256
348d6ee5d14cba4dd47355c7c521bf085824359b0285fd0f769678dc8c4edcea

SHA512
590948c3b4e32685a6d4bbb14017c145f061f15e28d3ba1f26ef0d14a01adf2ab029fa11ee4ab2881612084b34e63f30d49d8867dcb0a463a848b6c253f8e488

Download Submit
memory/1968-0-0x00007FFE86713000-0x00007FFE86715000-memory.dmp

Filesize
8KB

Download
memory/1968-1-0x0000000000950000-0x0000000000C74000-memory.dmp

Filesize
3.1MB

Download
memory/1968-2-0x00007FFE86710000-0x00007FFE871D1000-memory.dmp

Filesize
10.8MB

Download
memory/1968-9-0x00007FFE86710000-0x00007FFE871D1000-memory.dmp

Filesize
10.8MB

Download
memory/2960-10-0x00007FFE86710000-0x00007FFE871D1000-memory.dmp

Filesize
10.8MB

Download
memory/2960-11-0x000000001C540000-0x000000001C590000-memory.dmp

Filesize
320KB

Download
memory/2960-12-0x000000001CDC0000-0x000000001CE72000-memory.dmp

Filesize
712KB

Download