asyncrat | 25babc8d9be2e6cc3cdd408fac70bea0d9c3f0c3480945d3bcb374c88b6f82c1

Analysis

max time kernel
150s
max time network
154s
platform
windows7_x64
resource
win7
submitted
09-07-2020 18:41

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General

Target

f635d6dbb86f7d946250514c9ccb7db0.exe
Size

256KB
MD5

f635d6dbb86f7d946250514c9ccb7db0
SHA1

f11402b0dba9a9c81399c2f557b11deac2620c55
SHA256

25babc8d9be2e6cc3cdd408fac70bea0d9c3f0c3480945d3bcb374c88b6f82c1
SHA512

e02ba39e68acd88724acda61ac1feb501a0d070022c22863e7dd2fa2dc160a15d56e302a5ad1ad200d70091098d764c542cdf88d88d917d5f988ae36d80d9d9c

Score

10^/10

asyncrat quasar evasion persistence rat spyware trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

null:null

Mutex

AsyncMutex_6SI8OkPnk

Attributes

aes_key
EfA8oEwdphb1PRVOxTe3AN4wESj6UjIj
anti_detection
false
autorun
true
bdos
false
delay
CORONA
host
null
hwid
3
install_file
install_folder
%AppData%
mutex
AsyncMutex_6SI8OkPnk
pastebin_config
https://pastebin.com/raw/KVXdCZYr
port
null
version
0.5.7B

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Contains code to disable Windows Defender 4 IoCs

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

resource	yara_rule
behavioral1/memory/1772-35-0x0000000000400000-0x0000000000454000-memory.dmp	disable_win_def
behavioral1/memory/1772-36-0x000000000044FF42-mapping.dmp	disable_win_def
behavioral1/memory/1772-38-0x0000000000400000-0x0000000000454000-memory.dmp	disable_win_def
behavioral1/memory/1772-39-0x0000000000400000-0x0000000000454000-memory.dmp	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Modifies security service 2 TTPs 2 IoCs

evasion

Modify Registry

T1112

Modify Existing Service

T1031

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\WinDefend\Start = "4"	kgdxez.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet002\services\WinDefend\Start = "4"	kgdxez.exe

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
UAC bypass 3 TTPs
evasion trojan

Bypass User Account Control
T1088

Disabling Security Tools
T1089

Modify Registry
T1112
Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112

Async RAT payload 7 IoCs

rat

resource	yara_rule
behavioral1/memory/876-2-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/876-3-0x000000000040C78E-mapping.dmp	asyncrat
behavioral1/memory/876-4-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/876-5-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1976-19-0x000000000040C78E-mapping.dmp	asyncrat
behavioral1/memory/1976-21-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1976-22-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Executes dropped EXE 5 IoCs

pid	Process
1768	chromegoogle.exe
1976	chromegoogle.exe
1056	kgdxez.exe
1772	kgdxez.exe
1504	DHender.exe

Loads dropped DLL 4 IoCs

pid	Process
1532	cmd.exe
1556	powershell.exe
1056	kgdxez.exe
1772	kgdxez.exe

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\DisableAntiSpyware = "1"	kgdxez.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	kgdxez.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	kgdxez.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "1"	kgdxez.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\OfficeTelemetry = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\kgdxez.exe\""	kgdxez.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeTelemetry = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\kgdxez.exe\""	kgdxez.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	kgdxez.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	kgdxez.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

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
15	ip-api.com

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 608 set thread context of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 1768 set thread context of 1976	1768	chromegoogle.exe	34
PID 1056 set thread context of 1772	1056	kgdxez.exe	40

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

T1053

pid	Process
1760	schtasks.exe
1128	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1788	timeout.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
876	f635d6dbb86f7d946250514c9ccb7db0.exe
876	f635d6dbb86f7d946250514c9ccb7db0.exe
1556	powershell.exe
1976	chromegoogle.exe
1556	powershell.exe
1992	powershell.exe
1992	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	876	f635d6dbb86f7d946250514c9ccb7db0.exe
Token: SeDebugPrivilege	1976	chromegoogle.exe
Token: SeDebugPrivilege	1556	powershell.exe
Token: SeDebugPrivilege	1772	kgdxez.exe
Token: SeDebugPrivilege	1992	powershell.exe

Suspicious use of WriteProcessMemory 75 IoCs

description	pid	Process	procid_target
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 608 wrote to memory of 876	608	f635d6dbb86f7d946250514c9ccb7db0.exe	24
PID 876 wrote to memory of 1040	876	f635d6dbb86f7d946250514c9ccb7db0.exe	25
PID 876 wrote to memory of 1040	876	f635d6dbb86f7d946250514c9ccb7db0.exe	25
PID 876 wrote to memory of 1040	876	f635d6dbb86f7d946250514c9ccb7db0.exe	25
PID 876 wrote to memory of 1040	876	f635d6dbb86f7d946250514c9ccb7db0.exe	25
PID 876 wrote to memory of 1532	876	f635d6dbb86f7d946250514c9ccb7db0.exe	27
PID 876 wrote to memory of 1532	876	f635d6dbb86f7d946250514c9ccb7db0.exe	27
PID 876 wrote to memory of 1532	876	f635d6dbb86f7d946250514c9ccb7db0.exe	27
PID 876 wrote to memory of 1532	876	f635d6dbb86f7d946250514c9ccb7db0.exe	27
PID 1040 wrote to memory of 1760	1040	cmd.exe	29
PID 1040 wrote to memory of 1760	1040	cmd.exe	29
PID 1040 wrote to memory of 1760	1040	cmd.exe	29
PID 1040 wrote to memory of 1760	1040	cmd.exe	29
PID 1532 wrote to memory of 1788	1532	cmd.exe	30
PID 1532 wrote to memory of 1788	1532	cmd.exe	30
PID 1532 wrote to memory of 1788	1532	cmd.exe	30
PID 1532 wrote to memory of 1788	1532	cmd.exe	30
PID 1532 wrote to memory of 1768	1532	cmd.exe	31
PID 1532 wrote to memory of 1768	1532	cmd.exe	31
PID 1532 wrote to memory of 1768	1532	cmd.exe	31
PID 1532 wrote to memory of 1768	1532	cmd.exe	31
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1768 wrote to memory of 1976	1768	chromegoogle.exe	34
PID 1976 wrote to memory of 1812	1976	chromegoogle.exe	36
PID 1976 wrote to memory of 1812	1976	chromegoogle.exe	36
PID 1976 wrote to memory of 1812	1976	chromegoogle.exe	36
PID 1976 wrote to memory of 1812	1976	chromegoogle.exe	36
PID 1812 wrote to memory of 1556	1812	cmd.exe	38
PID 1812 wrote to memory of 1556	1812	cmd.exe	38
PID 1812 wrote to memory of 1556	1812	cmd.exe	38
PID 1812 wrote to memory of 1556	1812	cmd.exe	38
PID 1556 wrote to memory of 1056	1556	powershell.exe	39
PID 1556 wrote to memory of 1056	1556	powershell.exe	39
PID 1556 wrote to memory of 1056	1556	powershell.exe	39
PID 1556 wrote to memory of 1056	1556	powershell.exe	39
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1056 wrote to memory of 1772	1056	kgdxez.exe	40
PID 1772 wrote to memory of 1128	1772	kgdxez.exe	41
PID 1772 wrote to memory of 1128	1772	kgdxez.exe	41
PID 1772 wrote to memory of 1128	1772	kgdxez.exe	41
PID 1772 wrote to memory of 1128	1772	kgdxez.exe	41
PID 1772 wrote to memory of 1880	1772	kgdxez.exe	43
PID 1772 wrote to memory of 1880	1772	kgdxez.exe	43
PID 1772 wrote to memory of 1880	1772	kgdxez.exe	43
PID 1772 wrote to memory of 1880	1772	kgdxez.exe	43
PID 1772 wrote to memory of 1992	1772	kgdxez.exe	45
PID 1772 wrote to memory of 1992	1772	kgdxez.exe	45
PID 1772 wrote to memory of 1992	1772	kgdxez.exe	45
PID 1772 wrote to memory of 1992	1772	kgdxez.exe	45
PID 1772 wrote to memory of 1504	1772	kgdxez.exe	47
PID 1772 wrote to memory of 1504	1772	kgdxez.exe	47
PID 1772 wrote to memory of 1504	1772	kgdxez.exe	47
PID 1772 wrote to memory of 1504	1772	kgdxez.exe	47

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	kgdxez.exe

C:\Users\Admin\AppData\Local\Temp\f635d6dbb86f7d946250514c9ccb7db0.exe
"C:\Users\Admin\AppData\Local\Temp\f635d6dbb86f7d946250514c9ccb7db0.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:608
- C:\Users\Admin\AppData\Local\Temp\f635d6dbb86f7d946250514c9ccb7db0.exe
  "C:\Users\Admin\AppData\Local\Temp\f635d6dbb86f7d946250514c9ccb7db0.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:876
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "chromegoogle" /tr '"C:\Users\Admin\AppData\Roaming\chromegoogle.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1040
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "chromegoogle" /tr '"C:\Users\Admin\AppData\Roaming\chromegoogle.exe"'
      4⤵
      Creates scheduled task(s)
      PID:1760
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp9C6D.tmp.bat""
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:1532
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:1788
  - - C:\Users\Admin\AppData\Roaming\chromegoogle.exe
      "C:\Users\Admin\AppData\Roaming\chromegoogle.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:1768
    - - C:\Users\Admin\AppData\Roaming\chromegoogle.exe
        
        "C:\Users\Admin\AppData\Roaming\chromegoogle.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1976
      - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\kgdxez.exe"' & exit
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:1812
        
        C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\kgdxez.exe"'
        7⤵
        Loads dropped DLL
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1556
        
        C:\Users\Admin\AppData\Local\Temp\kgdxez.exe
        
        "C:\Users\Admin\AppData\Local\Temp\kgdxez.exe"
        8⤵
        Executes dropped EXE
        Loads dropped DLL
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:1056
        
        C:\Users\Admin\AppData\Local\Temp\kgdxez.exe
        
        "C:\Users\Admin\AppData\Local\Temp\kgdxez.exe"
        9⤵
        Modifies security service
        Executes dropped EXE
        Loads dropped DLL
        Windows security modification
        Adds Run key to start application
        Checks whether UAC is enabled
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        System policy modification
        
        PID:1772
        
        C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "\Microsoft\Windows\NetTrace\PerfTrack\Files\OfficeTelemetry" /SC MINUTE /MO 3 /RL HIGHEST /tr "C:\Users\Admin\AppData\Local\Temp\kgdxez.exe" /f
        10⤵
        Creates scheduled task(s)
        
        PID:1128
        
        C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /delete /tn "OfficeTelemetry" /f
        10⤵
        
        PID:1880
        
        C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" Get-MpPreference -verbose
        10⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1992
        
        C:\Users\Admin\AppData\Roaming\DateVLog\DHender.exe
        
        "C:\Users\Admin\AppData\Roaming\DateVLog\DHender.exe"
        10⤵
        Executes dropped EXE
        
        PID:1504

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Bypass User Account Control

T1088

Scheduled Task

T1053

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Web Service

T1102

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

memory/876-4-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/876-5-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/876-2-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1772-39-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1772-35-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1772-38-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1976-22-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-21-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download