quasar | 87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549

General

Target

87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe
Size

3.1MB
MD5

4bee5738d5053f4ed951f72ece445d1a
SHA1

ed6ff5aa0d945449d4571c5cab6e5e7c95c32b4b
SHA256

87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549
SHA512

e55a837099572a9fecf096102bd6a6418c3786065e5b2be756d0f5f1ce817a84269f95a82c82ca2275a30659e13db83cbd62f1e7bb8a5b7f6cc4029153178ef9
SSDEEP

49152:avXI22SsaNYfdPBldt698dBcjHhFKKN3Mf90oGdyTHHB72eh2NT:avY22SsaNYfdPBldt6+dBcjHhQKNr

Score

10^/10

quasar dav spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

dav

C2

192.168.8.142:4782

Mutex

c8684c44-d5dc-43e5-b033-c2a97a0f52a7

Attributes

encryption_key
CBF8A101AC7D1A60E9971CAA6CDD2DFAE2D84DF4
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
StefCodes Antivirus
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2588-1-0x0000000000C80000-0x0000000000FA8000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\Client.exe	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2588-1-0x0000000000C80000-0x0000000000FA8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Windows\System32\SubDir\Client.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2588-1-0x0000000000C80000-0x0000000000FA8000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Windows\System32\SubDir\Client.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2588-1-0x0000000000C80000-0x0000000000FA8000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Windows\System32\SubDir\Client.exe	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2892 Client.exe

pid	process
2892	Client.exe

Drops file in System32 directory 5 IoCs

Processes:

87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exeClient.exe

description	ioc	process
File created	C:\Windows\system32\SubDir\Client.exe	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe
File opened for modification	C:\Windows\system32\SubDir	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	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

4216 schtasks.exe
2552 schtasks.exe

pid	process
4216	schtasks.exe
2552	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2588	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe
Token: SeDebugPrivilege	2892	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2892 Client.exe

pid	process
2892	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exeClient.exe

description	pid	process	target process
PID 2588 wrote to memory of 2552	2588	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe	schtasks.exe
PID 2588 wrote to memory of 2552	2588	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe	schtasks.exe
PID 2588 wrote to memory of 2892	2588	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe	Client.exe
PID 2588 wrote to memory of 2892	2588	87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe	Client.exe
PID 2892 wrote to memory of 4216	2892	Client.exe	schtasks.exe
PID 2892 wrote to memory of 4216	2892	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\87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe
"C:\Users\Admin\AppData\Local\Temp\87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2588

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "StefCodes Antivirus" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2552

C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2892

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "StefCodes Antivirus" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4216

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=4744,i,15142778360084620907,1763097090506261076,262144 --variations-seed-version --mojo-platform-channel-handle=4372 /prefetch:8
1⤵
PID:3484

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

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
4bee5738d5053f4ed951f72ece445d1a

SHA1
ed6ff5aa0d945449d4571c5cab6e5e7c95c32b4b

SHA256
87d05f252e2417d280bb8c7110f9913e54e5f89fb209181f47eaaad6553ce549

SHA512
e55a837099572a9fecf096102bd6a6418c3786065e5b2be756d0f5f1ce817a84269f95a82c82ca2275a30659e13db83cbd62f1e7bb8a5b7f6cc4029153178ef9

Download Submit
memory/2588-0-0x00007FFAFBF53000-0x00007FFAFBF55000-memory.dmp

Filesize
8KB

Download
memory/2588-1-0x0000000000C80000-0x0000000000FA8000-memory.dmp

Filesize
3.2MB

Download
memory/2588-2-0x00007FFAFBF50000-0x00007FFAFCA11000-memory.dmp

Filesize
10.8MB

Download
memory/2588-9-0x00007FFAFBF50000-0x00007FFAFCA11000-memory.dmp

Filesize
10.8MB

Download
memory/2892-10-0x00007FFAFBF50000-0x00007FFAFCA11000-memory.dmp

Filesize
10.8MB

Download
memory/2892-11-0x00007FFAFBF50000-0x00007FFAFCA11000-memory.dmp

Filesize
10.8MB

Download
memory/2892-12-0x000000001BA20000-0x000000001BA70000-memory.dmp

Filesize
320KB

Download
memory/2892-13-0x000000001C2C0000-0x000000001C372000-memory.dmp

Filesize
712KB

Download
memory/2892-14-0x00007FFAFBF50000-0x00007FFAFCA11000-memory.dmp

Filesize
10.8MB

Download
memory/2892-15-0x00007FFAFBF50000-0x00007FFAFCA11000-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