quasar | 3fb34d34eaa6800dce2dce585ec89a9b3f98637c624c8774945af5ad8a37a3e8

General

Target

f6f83ba3f1e87503941e50b3e50d390f.exe
Size

17KB
MD5

f6f83ba3f1e87503941e50b3e50d390f
SHA1

6983d00bc9cda93f0da126504d99a851ffef6cea
SHA256

3fb34d34eaa6800dce2dce585ec89a9b3f98637c624c8774945af5ad8a37a3e8
SHA512

d9afb2024c16229d1245d1c8faf1a5fb7b1c2a4c2e379078e0c70493c8dedc7fb76be3233c4e9757168382b27b8ae4f17726209af893297fe67838472443e3d4
SSDEEP

384:O0CqWx4t+dWNzuY7/aAygucwhb6v/uFi:O0CL4sBTguJmei

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office04

C2

51.89.157.248:4782

Mutex

MvfU8Y7jQptTEqcSWG

Attributes

encryption_key
gfcyUhYEMEq5BWNn8aVX
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 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1064-146-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

f6f83ba3f1e87503941e50b3e50d390f.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	f6f83ba3f1e87503941e50b3e50d390f.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

f6f83ba3f1e87503941e50b3e50d390f.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\DriverHelp = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\DriverHelp.exe\""	f6f83ba3f1e87503941e50b3e50d390f.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

21 ip-api.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

f6f83ba3f1e87503941e50b3e50d390f.exe

description pid process target process

PID 4652 set thread context of 1064 4652 f6f83ba3f1e87503941e50b3e50d390f.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

5040 powershell.exe
5040 powershell.exe
2852 powershell.exe
2852 powershell.exe

flow	ioc
21	ip-api.com

description	pid	process	target process
PID 4652 set thread context of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe

pid	process
5040	powershell.exe
5040	powershell.exe
2852	powershell.exe
2852	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

f6f83ba3f1e87503941e50b3e50d390f.exepowershell.exepowershell.exeRegAsm.exe

description	pid	process
Token: SeDebugPrivilege	4652	f6f83ba3f1e87503941e50b3e50d390f.exe
Token: SeDebugPrivilege	5040	powershell.exe
Token: SeDebugPrivilege	2852	powershell.exe
Token: SeDebugPrivilege	1064	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RegAsm.exe

pid process

1064 RegAsm.exe

pid	process
1064	RegAsm.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

f6f83ba3f1e87503941e50b3e50d390f.execmd.exe

description	pid	process	target process
PID 4652 wrote to memory of 5040	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	powershell.exe
PID 4652 wrote to memory of 5040	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	powershell.exe
PID 4652 wrote to memory of 5040	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	powershell.exe
PID 4652 wrote to memory of 2640	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	cmd.exe
PID 4652 wrote to memory of 2640	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	cmd.exe
PID 4652 wrote to memory of 2640	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	cmd.exe
PID 2640 wrote to memory of 2852	2640	cmd.exe	powershell.exe
PID 2640 wrote to memory of 2852	2640	cmd.exe	powershell.exe
PID 2640 wrote to memory of 2852	2640	cmd.exe	powershell.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe
PID 4652 wrote to memory of 1064	4652	f6f83ba3f1e87503941e50b3e50d390f.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\f6f83ba3f1e87503941e50b3e50d390f.exe
"C:\Users\Admin\AppData\Local\Temp\f6f83ba3f1e87503941e50b3e50d390f.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4652

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5040

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
2⤵
- Suspicious use of WriteProcessMemory
PID:2640

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2852

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
2⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:1064

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
Filesize
1KB

MD5
4280e36a29fa31c01e4d8b2ba726a0d8

SHA1
c485c2c9ce0a99747b18d899b71dfa9a64dabe32

SHA256
e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359

SHA512
494fe5f0ade03669e5830bed93c964d69b86629440148d7b0881cf53203fd89443ebff9b4d1ee9d96244f62af6edede622d9eacba37f80f389a0d522e4ad4ea4

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
Filesize
53KB

MD5
06ad34f9739c5159b4d92d702545bd49

SHA1
9152a0d4f153f3f40f7e606be75f81b582ee0c17

SHA256
474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

SHA512
c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
16KB

MD5
a57a8a4b059139a91487d5abfc50afa1

SHA1
efda38603c53adf419f09faca0e975bd97f044a4

SHA256
21f356bc513114b6c139ea7872ad3b2e37e6a36804bc3cbe6b8f1b79251a406d

SHA512
4ec0d7bc736b282216ea2f88b22485365016511280d9abff4bb5ba2dcfb9842349bbd197e42984d203eabf57896fd544b68f722d39c595890f75a7e4266eabbd

Download Submit
memory/1064-158-0x0000000006010000-0x000000000601A000-memory.dmp

Filesize
40KB

Download
memory/1064-156-0x0000000005CA0000-0x0000000005CDC000-memory.dmp

Filesize
240KB

Download
memory/1064-155-0x0000000005860000-0x0000000005872000-memory.dmp

Filesize
72KB

Download
memory/1064-149-0x0000000004930000-0x00000000049C2000-memory.dmp

Filesize
584KB

Download
memory/1064-148-0x0000000004E30000-0x00000000053D4000-memory.dmp

Filesize
5.6MB

Download
memory/1064-146-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1064-145-0x0000000000000000-mapping.dmp

Download
memory/2640-142-0x0000000000000000-mapping.dmp

Download
memory/2852-153-0x0000000006C40000-0x0000000006C5E000-memory.dmp

Filesize
120KB

Download
memory/2852-154-0x0000000007A40000-0x0000000007A4A000-memory.dmp

Filesize
40KB

Download
memory/2852-161-0x0000000007BE0000-0x0000000007BE8000-memory.dmp

Filesize
32KB

Download
memory/2852-160-0x0000000007C00000-0x0000000007C1A000-memory.dmp

Filesize
104KB

Download
memory/2852-159-0x0000000006570000-0x000000000657E000-memory.dmp

Filesize
56KB

Download
memory/2852-143-0x0000000000000000-mapping.dmp

Download
memory/2852-157-0x0000000007C80000-0x0000000007D16000-memory.dmp

Filesize
600KB

Download
memory/2852-151-0x0000000006C70000-0x0000000006CA2000-memory.dmp

Filesize
200KB

Download
memory/2852-152-0x0000000071060000-0x00000000710AC000-memory.dmp

Filesize
304KB

Download
memory/4652-133-0x0000000005D50000-0x0000000005D72000-memory.dmp

Filesize
136KB

Download
memory/4652-132-0x0000000000590000-0x000000000059A000-memory.dmp

Filesize
40KB

Download
memory/5040-138-0x0000000005E10000-0x0000000005E76000-memory.dmp

Filesize
408KB

Download
memory/5040-135-0x0000000002B10000-0x0000000002B46000-memory.dmp

Filesize
216KB

Download
memory/5040-134-0x0000000000000000-mapping.dmp

Download
memory/5040-136-0x00000000055D0000-0x0000000005BF8000-memory.dmp

Filesize
6.2MB

Download
memory/5040-137-0x0000000005C70000-0x0000000005CD6000-memory.dmp

Filesize
408KB

Download
memory/5040-139-0x0000000006440000-0x000000000645E000-memory.dmp

Filesize
120KB

Download
memory/5040-140-0x0000000007C90000-0x000000000830A000-memory.dmp

Filesize
6.5MB

Download
memory/5040-141-0x0000000006940000-0x000000000695A000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads