quasar | 03055e3bc47f74cb752766066d37bbc32a7d727e8e8de1de1f780c438d9fb1f7

General

Target

Client-built.exe
Size

3.1MB
MD5

d9d2f3f3c982bc80c1bcb48a57c9d50b
SHA1

ceae970e826fe18f86334df80e369eb048855f46
SHA256

03055e3bc47f74cb752766066d37bbc32a7d727e8e8de1de1f780c438d9fb1f7
SHA512

48ed7dc971f134a0f7dd651157ae74a71ea393b458a19f20cbf1e17a017eb5ab18bf083ca46ff7e950ceb7daebe52484ada180fa19fdd1a00d2863977904dd3b
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjHxwWEGzvk/ZSMoGdkdETHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHxwZlU

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.116:4782

Mutex

97ed6976-1ac2-4546-9b3d-21da0d014a4b

Attributes

encryption_key
9C4EA8E0DF89BE6122CBCA3F1DCCDAE968F75366
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 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2952-1-0x00000000005E0000-0x0000000000904000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1088 Client.exe

pid	process
1088	Client.exe

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

taskmgr.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	taskmgr.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

2600 schtasks.exe
4372 schtasks.exe

pid	process
2600	schtasks.exe
4372	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

Processes:

taskmgr.exe

pid	process
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

Processes:

Client-built.exeClient.exetaskmgr.exeClient-built.exeClient-built.exe

description	pid	process
Token: SeDebugPrivilege	2952	Client-built.exe
Token: SeDebugPrivilege	1088	Client.exe
Token: SeDebugPrivilege	2340	taskmgr.exe
Token: SeSystemProfilePrivilege	2340	taskmgr.exe
Token: SeCreateGlobalPrivilege	2340	taskmgr.exe
Token: 33	2340	taskmgr.exe
Token: SeIncBasePriorityPrivilege	2340	taskmgr.exe
Token: SeDebugPrivilege	1120	Client-built.exe
Token: SeDebugPrivilege	3948	Client-built.exe

Suspicious use of FindShellTrayWindow 37 IoCs

Processes:

taskmgr.exe

pid	process
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe

Suspicious use of SendNotifyMessage 37 IoCs

Processes:

taskmgr.exe

pid	process
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe
2340	taskmgr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1088 Client.exe

pid	process
1088	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2952 wrote to memory of 2600	2952	Client-built.exe	schtasks.exe
PID 2952 wrote to memory of 2600	2952	Client-built.exe	schtasks.exe
PID 2952 wrote to memory of 1088	2952	Client-built.exe	Client.exe
PID 2952 wrote to memory of 1088	2952	Client-built.exe	Client.exe
PID 1088 wrote to memory of 4372	1088	Client.exe	schtasks.exe
PID 1088 wrote to memory of 4372	1088	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2952

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:2600

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:1088

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:4372

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:2340

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4548

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1120

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3948

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client-built.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

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

Filesize
3.1MB

MD5
d9d2f3f3c982bc80c1bcb48a57c9d50b

SHA1
ceae970e826fe18f86334df80e369eb048855f46

SHA256
03055e3bc47f74cb752766066d37bbc32a7d727e8e8de1de1f780c438d9fb1f7

SHA512
48ed7dc971f134a0f7dd651157ae74a71ea393b458a19f20cbf1e17a017eb5ab18bf083ca46ff7e950ceb7daebe52484ada180fa19fdd1a00d2863977904dd3b

Download Submit
memory/1088-14-0x00007FFF52840000-0x00007FFF53301000-memory.dmp

Filesize
10.8MB

Download
memory/1088-30-0x00000000014C0000-0x0000000001568000-memory.dmp

Filesize
672KB

Download
memory/1088-9-0x00007FFF52840000-0x00007FFF53301000-memory.dmp

Filesize
10.8MB

Download
memory/1088-28-0x000000001CC50000-0x000000001D178000-memory.dmp

Filesize
5.2MB

Download
memory/1088-11-0x00007FFF52840000-0x00007FFF53301000-memory.dmp

Filesize
10.8MB

Download
memory/1088-12-0x000000001C010000-0x000000001C060000-memory.dmp

Filesize
320KB

Download
memory/1088-13-0x000000001C120000-0x000000001C1D2000-memory.dmp

Filesize
712KB

Download
memory/2340-25-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-24-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-17-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-15-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-27-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-26-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-21-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-16-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-23-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2340-22-0x000001677B680000-0x000001677B681000-memory.dmp

Filesize
4KB

Download
memory/2952-0-0x00007FFF52843000-0x00007FFF52845000-memory.dmp

Filesize
8KB

Download
memory/2952-10-0x00007FFF52840000-0x00007FFF53301000-memory.dmp

Filesize
10.8MB

Download
memory/2952-2-0x00007FFF52840000-0x00007FFF53301000-memory.dmp

Filesize
10.8MB

Download
memory/2952-1-0x00000000005E0000-0x0000000000904000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads