quasar | c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19

General

Target

c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe
Size

3.1MB
MD5

a168c79cb0994efc2f80bd9b6f951e76
SHA1

6481ba3c76ec8b2c29baa40dd2c21a00bb0c031f
SHA256

c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19
SHA512

1b8062baf7d872c3b8d56d538721c6fb04e4851703dda8e38783939f87cfc05e1b27c691303fa8e684081d57abb9f2ccbfd849bc72cda9b9d1a4785ca3604a82
SSDEEP

49152:ovtI22SsaNYfdPBldt698dBcjH631xbRkpoGdpcwJTHHB72eh2NT:ovm22SsaNYfdPBldt6+dBcjH631Uy

Score

10^/10

quasar client spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Client

C2

109.55.109.94:4782

Mutex

9af07297-b3a5-4f50-bb78-b1b9252cfa10

Attributes

encryption_key
AD5756ABD65F0F63A74CD6A753331631B4A27F41
install_name
SubDir.exe
log_directory
Logs
reconnect_delay
3000
startup_key
HealthSystemTray
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/2840-0-0x0000000000510000-0x0000000000834000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\SubDir.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

SubDir.exe

pid process

1556 SubDir.exe

pid	process
1556	SubDir.exe

Drops file in System32 directory 5 IoCs

Processes:

SubDir.exec328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe

description	ioc	process
File opened for modification	C:\Windows\system32\SubDir\SubDir.exe	SubDir.exe
File opened for modification	C:\Windows\system32\SubDir	SubDir.exe
File created	C:\Windows\system32\SubDir\SubDir.exe	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe
File opened for modification	C:\Windows\system32\SubDir\SubDir.exe	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe
File opened for modification	C:\Windows\system32\SubDir	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.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

2548 schtasks.exe
4536 schtasks.exe

pid	process
2548	schtasks.exe
4536	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exeSubDir.exe

description	pid	process
Token: SeDebugPrivilege	2840	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe
Token: SeDebugPrivilege	1556	SubDir.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

SubDir.exe

pid process

1556 SubDir.exe

pid	process
1556	SubDir.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exeSubDir.exe

description	pid	process	target process
PID 2840 wrote to memory of 2548	2840	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe	schtasks.exe
PID 2840 wrote to memory of 2548	2840	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe	schtasks.exe
PID 2840 wrote to memory of 1556	2840	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe	SubDir.exe
PID 2840 wrote to memory of 1556	2840	c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe	SubDir.exe
PID 1556 wrote to memory of 4536	1556	SubDir.exe	schtasks.exe
PID 1556 wrote to memory of 4536	1556	SubDir.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\c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe
"C:\Users\Admin\AppData\Local\Temp\c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2840

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "HealthSystemTray" /sc ONLOGON /tr "C:\Windows\system32\SubDir\SubDir.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2548

C:\Windows\system32\SubDir\SubDir.exe
"C:\Windows\system32\SubDir\SubDir.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1556

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "HealthSystemTray" /sc ONLOGON /tr "C:\Windows\system32\SubDir\SubDir.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4536

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:\Windows\System32\SubDir\SubDir.exe
Filesize
3.1MB

MD5
a168c79cb0994efc2f80bd9b6f951e76

SHA1
6481ba3c76ec8b2c29baa40dd2c21a00bb0c031f

SHA256
c328534fe8df97ccd8ff9fec54f6760f2aa9c0af3f4aa49268d83c1bbafcde19

SHA512
1b8062baf7d872c3b8d56d538721c6fb04e4851703dda8e38783939f87cfc05e1b27c691303fa8e684081d57abb9f2ccbfd849bc72cda9b9d1a4785ca3604a82

Download Submit
memory/1556-9-0x00007FF880C80000-0x00007FF881741000-memory.dmp

Filesize
10.8MB

Download
memory/1556-11-0x0000000001A80000-0x0000000001AD0000-memory.dmp

Filesize
320KB

Download
memory/1556-12-0x000000001C6D0000-0x000000001C782000-memory.dmp

Filesize
712KB

Download
memory/1556-13-0x00007FF880C80000-0x00007FF881741000-memory.dmp

Filesize
10.8MB

Download
memory/1556-14-0x000000001BE60000-0x000000001BE70000-memory.dmp

Filesize
64KB

Download
memory/2840-0-0x0000000000510000-0x0000000000834000-memory.dmp

Filesize
3.1MB

Download
memory/2840-1-0x00007FF880C80000-0x00007FF881741000-memory.dmp

Filesize
10.8MB

Download
memory/2840-2-0x000000001B460000-0x000000001B470000-memory.dmp

Filesize
64KB

Download
memory/2840-10-0x00007FF880C80000-0x00007FF881741000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads