asyncrat | 380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9

General

Target

JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js
Size

197KB
MD5

308d7ff7f284eed50cb29aedc8f3bb48
SHA1

3cf054753beb7c857c198b5def3804e29f3426ff
SHA256

380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9
SHA512

c393d34572c134d6ad6bb7b90598d04275f08f00b51d6acd2d4709df2460fe67ea347e4cd0baf8134cac9d776721f627601ea8ca9599147965220435cabac0be
SSDEEP

3072:31HYHcps3mbJHdLibcIdTDtf39sJb1kQAnF1Ea0pP+:3sMs2XeDd9fNEY

Score

10^/10

asyncrat default discovery execution persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

franmhort.duia.ro:8153

Mutex

Mutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
win.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x0008000000023c5e-10.dat	family_asyncrat

Checks computer location settings 2 TTPs 4 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	AsyncClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	wscript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js	wscript.exe

Executes dropped EXE 2 IoCs

pid	Process
5032	AsyncClient.exe
2076	win.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js\""	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js\""	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js\""	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js\""	wscript.exe

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4296	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4348	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe
5032	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5032	AsyncClient.exe
Token: SeDebugPrivilege	2076	win.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 1252	4244	wscript.exe	82
PID 4244 wrote to memory of 1252	4244	wscript.exe	82
PID 4244 wrote to memory of 3500	4244	wscript.exe	83
PID 4244 wrote to memory of 3500	4244	wscript.exe	83
PID 3500 wrote to memory of 1092	3500	wscript.exe	85
PID 3500 wrote to memory of 1092	3500	wscript.exe	85
PID 1252 wrote to memory of 5032	1252	wscript.exe	84
PID 1252 wrote to memory of 5032	1252	wscript.exe	84
PID 1252 wrote to memory of 5032	1252	wscript.exe	84
PID 5032 wrote to memory of 4500	5032	AsyncClient.exe	87
PID 5032 wrote to memory of 4500	5032	AsyncClient.exe	87
PID 5032 wrote to memory of 4500	5032	AsyncClient.exe	87
PID 5032 wrote to memory of 4960	5032	AsyncClient.exe	89
PID 5032 wrote to memory of 4960	5032	AsyncClient.exe	89
PID 5032 wrote to memory of 4960	5032	AsyncClient.exe	89
PID 4960 wrote to memory of 4296	4960	cmd.exe	91
PID 4960 wrote to memory of 4296	4960	cmd.exe	91
PID 4960 wrote to memory of 4296	4960	cmd.exe	91
PID 4500 wrote to memory of 4348	4500	cmd.exe	92
PID 4500 wrote to memory of 4348	4500	cmd.exe	92
PID 4500 wrote to memory of 4348	4500	cmd.exe	92
PID 4960 wrote to memory of 2076	4960	cmd.exe	93
PID 4960 wrote to memory of 2076	4960	cmd.exe	93
PID 4960 wrote to memory of 2076	4960	cmd.exe	93

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4244
- C:\Windows\System32\wscript.exe
  "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:1252
- - C:\Users\Admin\AppData\Roaming\AsyncClient.exe
    "C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:5032
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "win" /tr '"C:\Users\Admin\AppData\Roaming\win.exe"' & exit
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4500
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "win" /tr '"C:\Users\Admin\AppData\Roaming\win.exe"'
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:4348
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9402.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4960
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:4296
    - - C:\Users\Admin\AppData\Roaming\win.exe
        
        "C:\Users\Admin\AppData\Roaming\win.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:2076
- C:\Windows\System32\wscript.exe
  "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:3500
- - C:\Windows\System32\wscript.exe
    "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
    3⤵
    PID:1092

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

JavaScript

1

T1059.007

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp9402.tmp.bat

Filesize
147B

MD5
5ce4d74c094d88b86dc877f332d1c10a

SHA1
9bb3f889b988562e8aff7a12cbca7f4d14d9158e

SHA256
20df95d437390eec6c35214197122e07e8532c1cd97164c61b8085b94e348ecd

SHA512
f528182ad1416752a59b1dd7828adbe039522cf5d6e3c81e0f4034db1b37ca3bf6b801ec0db05296889b1d14c3005b6f3bb037f4fe031f6e5266736885279e30

Download Submit
C:\Users\Admin\AppData\Roaming\AsyncClient.exe

Filesize
45KB

MD5
cbdce3b5e2939fe92312004dcb31151f

SHA1
6f11f275c611decd4659f23a4593103f327806a6

SHA256
6ccc49875c2d837f462c4c3bd81f80b3be93f8435e8a22e042b5db025a31a6e3

SHA512
6240f21957016db0607987c81b110e78640d20eeba2dc0274cf6e6741cfd7924ca3b42325405e620f423157c34f355f188dbf60de96421e87f0d53e271fcc2c8

Download Submit
C:\Users\Admin\AppData\Roaming\JaffaCakes118_380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9.js

Filesize
197KB

MD5
308d7ff7f284eed50cb29aedc8f3bb48

SHA1
3cf054753beb7c857c198b5def3804e29f3426ff

SHA256
380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9

SHA512
c393d34572c134d6ad6bb7b90598d04275f08f00b51d6acd2d4709df2460fe67ea347e4cd0baf8134cac9d776721f627601ea8ca9599147965220435cabac0be

Download Submit
C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js

Filesize
90KB

MD5
18024bce1779bd2a699774f49a7ccb9e

SHA1
71d98c4b2509d40ebd128817051f8ca0271f3710

SHA256
16240be574ce82b98e9484ff2e2fcbe087f62da6f2b35eb38a67df109ee2803c

SHA512
d92c8e3b8e5b6225bd8a0f94a445fef52d012c20feccee8d4c7f3591ce6a806f83050a95780862f1acb6b18ba41a766043f9f7d1397bec0660043bb5d05696c3

Download Submit
memory/5032-21-0x0000000000970000-0x0000000000982000-memory.dmp

Filesize
72KB

Download
memory/5032-22-0x00000000053C0000-0x000000000545C000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads