quasar | fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314

Analysis

max time kernel
52s
max time network
44s
platform
windows7_x64
resource
win7-20220414-en
submitted
12-05-2022 11:55

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General

Target

fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe
Size

757KB
MD5

2957c39376a38df6aefaee72674c92af
SHA1

f32007bbb1c99bda6e4c97b4a695e87913fd87b1
SHA256

fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314
SHA512

8cecae621972be05ab9be0071689fcf29028f63b1519c4698d531bc754af7363f7bc21dbfb1d97e75914d884ecf4e1264ff20b2903f7b11c45dc88a77ec5dcbc

Score

10^/10

quasar persistence spyware trojan

Malware Config

Extracted

Family

quasar

Mutex

Attributes

encryption_key
install_name
log_directory
reconnect_delay
3000
startup_key
subdirectory

Signatures

Contains code to disable Windows Defender 6 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

Processes:

resource	yara_rule
behavioral1/memory/1160-63-0x0000000000400000-0x000000000048E000-memory.dmp	disable_win_def
behavioral1/memory/1160-64-0x0000000000400000-0x000000000048E000-memory.dmp	disable_win_def
behavioral1/memory/1160-65-0x0000000000400000-0x000000000048E000-memory.dmp	disable_win_def
behavioral1/memory/1160-66-0x0000000000488B8E-mapping.dmp	disable_win_def
behavioral1/memory/1160-68-0x0000000000400000-0x000000000048E000-memory.dmp	disable_win_def
behavioral1/memory/1160-70-0x0000000000400000-0x000000000048E000-memory.dmp	disable_win_def

Quasar Payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1160-63-0x0000000000400000-0x000000000048E000-memory.dmp	family_quasar
behavioral1/memory/1160-64-0x0000000000400000-0x000000000048E000-memory.dmp	family_quasar
behavioral1/memory/1160-65-0x0000000000400000-0x000000000048E000-memory.dmp	family_quasar
behavioral1/memory/1160-66-0x0000000000488B8E-mapping.dmp	family_quasar
behavioral1/memory/1160-68-0x0000000000400000-0x000000000048E000-memory.dmp	family_quasar
behavioral1/memory/1160-70-0x0000000000400000-0x000000000048E000-memory.dmp	family_quasar

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

powershell.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-790309383-526510583-3802439154-1000\Software\Microsoft\Windows\CurrentVersion\Run\lxxgldt snybyasm = "C:\\Users\\Admin\\AppData\\Roaming\\fdfhhuxv ssqavqkxj\\chome_exe.exe"	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe

description	pid	Process	procid_target
PID 1472 set thread context of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

RegAsm.exe

pid	Process
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe
1160	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

RegAsm.exepowershell.exe

description	pid	Process
Token: SeDebugPrivilege	1160	RegAsm.exe
Token: SeDebugPrivilege	1812	powershell.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

RegAsm.exe

pid	Process
1160	RegAsm.exe
1160	RegAsm.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exeRegAsm.exe

description	pid	Process	procid_target
PID 1472 wrote to memory of 1812	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	26
PID 1472 wrote to memory of 1812	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	26
PID 1472 wrote to memory of 1812	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	26
PID 1472 wrote to memory of 1812	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	26
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1472 wrote to memory of 1160	1472	fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe	28
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29
PID 1160 wrote to memory of 928	1160	RegAsm.exe	29

C:\Users\Admin\AppData\Local\Temp\fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe
"C:\Users\Admin\AppData\Local\Temp\fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1472
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Remove-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'lxxgldt snybyasm';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'lxxgldt snybyasm' -Value '"C:\Users\Admin\AppData\Roaming\fdfhhuxv ssqavqkxj\chome_exe.exe"' -PropertyType 'String'
  2⤵
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  PID:1812
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1160
- - \??\c:\windows\SysWOW64\cmstp.exe
    "c:\windows\system32\cmstp.exe" /au C:\Windows\temp\wh4steqt.inf
    3⤵
    PID:928

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\temp\wh4steqt.inf

Filesize
606B

MD5
ff2f17302139038f59548fe0ea4f97dc

SHA1
05e3a84df2168c94fad69d805ee5ef09582d3cad

SHA256
d109ea62e699ba48155b6b52e1a2f14f65dd88fb90d7cb7ae8976baeac358be4

SHA512
83f897f1b35de84aed7b06674fcb67b27575474bf627bbcd48ee87805e6a492faa0df4741e11372cc567bfa6a38150983d75a907bd1296bdceb0e1b85144124f

Download Submit
memory/928-72-0x0000000000000000-mapping.dmp

Download
memory/1160-70-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-65-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-75-0x0000000001115000-0x0000000001126000-memory.dmp

Filesize
68KB

Download
memory/1160-60-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-61-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-63-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-64-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-68-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/1160-66-0x0000000000488B8E-mapping.dmp

Download
memory/1472-57-0x0000000004930000-0x00000000049C0000-memory.dmp

Filesize
576KB

Download
memory/1472-54-0x0000000000310000-0x00000000003D4000-memory.dmp

Filesize
784KB

Download
memory/1472-56-0x0000000074F21000-0x0000000074F23000-memory.dmp

Filesize
8KB

Download
memory/1472-55-0x0000000004720000-0x00000000047B2000-memory.dmp

Filesize
584KB

Download
memory/1812-58-0x0000000000000000-mapping.dmp

Download
memory/1812-76-0x0000000073E50000-0x00000000743FB000-memory.dmp

Filesize
5.7MB

Download