asyncrat | b20bdd03ad605edafccbed9cbf281d1fd370116dd07e335fc2f428e9efb2863b

General

Target

tmp.exe
Size

479KB
MD5

4c6b01344809054252095695fe24aa5f
SHA1

d1571b19723ebb0def5a71b7d977ef4c5bdb66ab
SHA256

b20bdd03ad605edafccbed9cbf281d1fd370116dd07e335fc2f428e9efb2863b
SHA512

a26600e8233e90034a3a731246bdc634bc30478ea995c37317ef2e8139200f09446c4b78b500ffec5d7a84045790d0e80d20e4ba58cf28f0e4358f80e1db3af0

Score

10^/10

asyncrat neshta default evasion persistence rat spyware stealer trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

secureyourdataarea1.duckdns.org:56390

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
install_file
svchost.exe
install_folder
%AppData%

aes.plain

Signatures

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

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Modify Existing Service

T1031

Disabling Security Tools

T1089

Processes:

tmp.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	tmp.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	tmp.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	tmp.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	tmp.exe

Modifies system executable filetype association 2 TTPs 1 IoCs
persistence

Modify Registry
T1112

Change Default File Association
T1042

Processes:

tmp.exe

description ioc process

Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*" tmp.exe
Neshta
Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.
persistence spyware neshta

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*"	tmp.exe

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/4412-136-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

tmp.exetmp.exe

pid process

3552 tmp.exe
4412 tmp.exe
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:

tmp.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2280897447-3291712302-3137480060-1000\Control Panel\International\Geo\Nation tmp.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

pid	process
3552	tmp.exe
4412	tmp.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2280897447-3291712302-3137480060-1000\Control Panel\International\Geo\Nation	tmp.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

tmp.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	tmp.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	tmp.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

tmp.exe

description pid process target process

PID 3552 set thread context of 4412 3552 tmp.exe tmp.exe

description	pid	process	target process
PID 3552 set thread context of 4412	3552	tmp.exe	tmp.exe

Drops file in Program Files directory 64 IoCs

Processes:

tmp.exe

description	ioc	process
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOF5E2~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\13163~1.19\MI391D~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GO664E~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\BHO\IE_TO_~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\COOKIE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\MicrosoftEdgeUpdate.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WI8A19~1\ImagingDevices.exe	tmp.exe
File opened for modification	C:\PROGRA~3\Adobe\Setup\{AC76B~1\setup.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\MSInfo\msinfo32.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~4.EXE	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{61087~1\VCREDI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\PWAHEL~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\wmprph.exe	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{CA675~1\VCREDI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\INTERN~1\iexplore.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\NOTIFI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MOZILL~1\MAINTE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\AcroCEF\RdrCEF.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\msedge.exe	tmp.exe
File opened for modification	C:\PROGRA~2\INTERN~1\ExtExport.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\setup_wm.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\READER~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\WOW_HE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\INTERN~1\ieinstal.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\MSEDGE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\13163~1.19\MICROS~4.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MOZILL~1\UNINST~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ACROTE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Adobe\ARM\1.0\ADOBEA~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\13163~1.19\MIA062~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\Download\{F3C4F~1\13163~1.19\MICROS~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\wmplayer.exe	tmp.exe
File opened for modification	C:\PROGRA~3\MICROS~1\CLICKT~1\{9AC08~1\INTEGR~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\13163~1.19\MI9C33~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Java\JAVAUP~1\jucheck.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOBD5D~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\DISABL~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\AcroRd32.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ADelRCP.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~2.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\MSEDGE~3.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\MSEDGE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~2\wabmig.exe	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{4D8DC~1\VC_RED~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ADOBEC~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\LOGTRA~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\arh.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\PWAHEL~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\FULLTR~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\INSTAL~1\setup.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\wmpconfig.exe	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{57A73~1\VC_RED~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ACROBR~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\Eula.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~2\wab.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\wmlaunch.exe	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{EF6B0~1\VCREDI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\Browser\WCCHRO~1\WCCHRO~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\13163~1.19\MICROS~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\IDENTI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Edge\APPLIC~1\920902~1.67\MSEDGE~2.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\EDGEUP~1\13163~1.19\MICROS~2.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Java\JAVAUP~1\jaureg.exe	tmp.exe

Drops file in Windows directory 1 IoCs

Processes:

tmp.exe

description ioc process

File opened for modification C:\Windows\svchost.com tmp.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

tmp.exe

description ioc process

Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*" tmp.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

1784 powershell.exe
1784 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

tmp.exetmp.exepowershell.exe

description pid process

Token: SeDebugPrivilege 3552 tmp.exe
Token: SeDebugPrivilege 4412 tmp.exe
Token: SeDebugPrivilege 1784 powershell.exe

description	ioc	process
File opened for modification	C:\Windows\svchost.com	tmp.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*"	tmp.exe

pid	process
1784	powershell.exe
1784	powershell.exe

description	pid	process
Token: SeDebugPrivilege	3552	tmp.exe
Token: SeDebugPrivilege	4412	tmp.exe
Token: SeDebugPrivilege	1784	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

tmp.exetmp.exetmp.exe

description	pid	process	target process
PID 3196 wrote to memory of 3552	3196	tmp.exe	tmp.exe
PID 3196 wrote to memory of 3552	3196	tmp.exe	tmp.exe
PID 3196 wrote to memory of 3552	3196	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 3552 wrote to memory of 4412	3552	tmp.exe	tmp.exe
PID 4412 wrote to memory of 1784	4412	tmp.exe	powershell.exe
PID 4412 wrote to memory of 1784	4412	tmp.exe	powershell.exe
PID 4412 wrote to memory of 1784	4412	tmp.exe	powershell.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Modifies system executable filetype association
- Checks computer location settings
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3196
- C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3552
- - C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe
    0
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    - Executes dropped EXE
    - Windows security modification
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4412
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell" Get-MpPreference -verbose
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1784

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Change Default File Association

1

T1042

Modify Existing Service

1

T1031

Privilege Escalation

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\tmp.exe.log

Filesize
944B

MD5
564716eed1d687a11ed72a316def6481

SHA1
c2423fc47318cd25ecfab00cff85179cba4a9e01

SHA256
636987560bea08b7ef5fd1886fd9b37e7d56aa7aa3ecb2b5d41129ae9150f615

SHA512
052a4405491981896103c1fad4fb3ce36b1a1a0ed21802e1aba58164580b10baef1ea2d8cc1384578a9b67392cf9bb1f9c4d006eca3794178e01457ce42dd761

Download Submit
C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
memory/1784-144-0x00000000025D0000-0x0000000002606000-memory.dmp

Filesize
216KB

Download
memory/1784-153-0x00000000071F0000-0x000000000720A000-memory.dmp

Filesize
104KB

Download
memory/1784-158-0x0000000007510000-0x0000000007518000-memory.dmp

Filesize
32KB

Download
memory/1784-157-0x0000000007530000-0x000000000754A000-memory.dmp

Filesize
104KB

Download
memory/1784-156-0x0000000007420000-0x000000000742E000-memory.dmp

Filesize
56KB

Download
memory/1784-155-0x0000000007470000-0x0000000007506000-memory.dmp

Filesize
600KB

Download
memory/1784-154-0x0000000007260000-0x000000000726A000-memory.dmp

Filesize
40KB

Download
memory/1784-152-0x0000000007840000-0x0000000007EBA000-memory.dmp

Filesize
6.5MB

Download
memory/1784-151-0x0000000006480000-0x000000000649E000-memory.dmp

Filesize
120KB

Download
memory/1784-143-0x0000000000000000-mapping.dmp

Download
memory/1784-150-0x0000000073CC0000-0x0000000073D0C000-memory.dmp

Filesize
304KB

Download
memory/1784-145-0x00000000051F0000-0x0000000005818000-memory.dmp

Filesize
6.2MB

Download
memory/1784-146-0x0000000004F40000-0x0000000004F62000-memory.dmp

Filesize
136KB

Download
memory/1784-147-0x0000000004FE0000-0x0000000005046000-memory.dmp

Filesize
408KB

Download
memory/1784-148-0x0000000005EF0000-0x0000000005F0E000-memory.dmp

Filesize
120KB

Download
memory/1784-149-0x00000000064C0000-0x00000000064F2000-memory.dmp

Filesize
200KB

Download
memory/3552-130-0x0000000000000000-mapping.dmp

Download
memory/3552-133-0x0000000000CB0000-0x0000000000D24000-memory.dmp

Filesize
464KB

Download
memory/3552-134-0x0000000006460000-0x00000000064FC000-memory.dmp

Filesize
624KB

Download
memory/4412-142-0x0000000006650000-0x000000000666E000-memory.dmp

Filesize
120KB

Download
memory/4412-141-0x0000000006BA0000-0x0000000006C16000-memory.dmp

Filesize
472KB

Download
memory/4412-135-0x0000000000000000-mapping.dmp

Download
memory/4412-140-0x00000000057B0000-0x0000000005816000-memory.dmp

Filesize
408KB

Download
memory/4412-139-0x0000000005CF0000-0x0000000006294000-memory.dmp

Filesize
5.6MB

Download
memory/4412-136-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads