quasar | 2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e

General

Target

2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe
Size

3.1MB
MD5

f54598770f770d815c9707dd33518eac
SHA1

6acf4aaf1d74710ef92c0b99a4b263202fbefcb7
SHA256

2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e
SHA512

dc927e84c41121e43f281af15ede1dcce368f1f94e88b56c893a1dfda8aa412547fe5f77d46fcc6a9fc8842b860edf4b3a3c059919b460d0f8611035d9e42d36
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjHutbXPEhNvJJaoGdwjTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHZhg

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

www.exiles.site:14782

Mutex

a0f587a6-d40f-499d-8e9e-b0831e1cb678

Attributes

encryption_key
49BF5A48970D914C7E70F494A8E16B5EFA3AB6A0
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2960-0-0x0000000000830000-0x0000000000B54000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/1292-8-0x0000000000E40000-0x0000000001164000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2960-0-0x0000000000830000-0x0000000000B54000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/1292-8-0x0000000000E40000-0x0000000001164000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2960-0-0x0000000000830000-0x0000000000B54000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/1292-8-0x0000000000E40000-0x0000000001164000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2960-0-0x0000000000830000-0x0000000000B54000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/1292-8-0x0000000000E40000-0x0000000001164000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1292 Client.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

852 schtasks.exe
2520 schtasks.exe

pid	process
1292	Client.exe

pid	process
852	schtasks.exe
2520	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe
Token: SeDebugPrivilege	1292	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1292 Client.exe

pid	process
1292	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exeClient.exe

description	pid	process	target process
PID 2960 wrote to memory of 852	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe	schtasks.exe
PID 2960 wrote to memory of 852	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe	schtasks.exe
PID 2960 wrote to memory of 852	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe	schtasks.exe
PID 2960 wrote to memory of 1292	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe	Client.exe
PID 2960 wrote to memory of 1292	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe	Client.exe
PID 2960 wrote to memory of 1292	2960	2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe	Client.exe
PID 1292 wrote to memory of 2520	1292	Client.exe	schtasks.exe
PID 1292 wrote to memory of 2520	1292	Client.exe	schtasks.exe
PID 1292 wrote to memory of 2520	1292	Client.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\2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe
"C:\Users\Admin\AppData\Local\Temp\2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2960

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:852

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1292

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2520

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
1024KB

MD5
486f132d536dbd901bf9be8a8d23995c

SHA1
b686b3ed435a45ae96cd8c009da537e30740a699

SHA256
6e338a5d73df0513c154857047e0785cee06093b237dd956e5edbdf074b33008

SHA512
d9b56b9c32f9f992df9b4b6faf450ca0b96420f4e2a571e364a00bb967b8c380e6901500660835ede6816aa68047a1ac269a431a3088cd678194b8eb0181f1bf

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
384KB

MD5
5919b96faad0fd3c25abadeb811a7da1

SHA1
44e34b6db55fc040c529c1003758f0df24dbc061

SHA256
79eb64e1671ebc6512a197e3f88e078de763a3fc806126f799075b540140d8b2

SHA512
78652bb3ec3a70a891643839c6a2d8f5760699530aedba00d772a43f60c53ba994102800e973a9ea9589e25b8f8b787e0588ed1a1da44176480758414fbba710

Download Submit
memory/1292-8-0x0000000000E40000-0x0000000001164000-memory.dmp

Filesize
3.1MB

Download
memory/1292-9-0x000007FEF59F0000-0x000007FEF63DC000-memory.dmp

Filesize
9.9MB

Download
memory/1292-11-0x000000001AF30000-0x000000001AFB0000-memory.dmp

Filesize
512KB

Download
memory/1292-12-0x000007FEF59F0000-0x000007FEF63DC000-memory.dmp

Filesize
9.9MB

Download
memory/2960-0-0x0000000000830000-0x0000000000B54000-memory.dmp

Filesize
3.1MB

Download
memory/2960-1-0x000007FEF59F0000-0x000007FEF63DC000-memory.dmp

Filesize
9.9MB

Download
memory/2960-2-0x000000001AB10000-0x000000001AB90000-memory.dmp

Filesize
512KB

Download
memory/2960-10-0x000007FEF59F0000-0x000007FEF63DC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads