asyncrat | 667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023

General

Target
667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
Size 45KB
Sample260804-lnvc6ack7w
SHA256 667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023
MD5 118e985c40df99d642cc8bbe5ed991db
SHA1 88fc038818cd272e4d0f0792a2142b4a262bcff1
SHA512 61d3604664b827616f03f9ccc453d0e8debc0ff1331fff6ec57e7f63cc86b0516d9343388bdc5226f91a2d491f7e4bae284319ad984251b4c67766dd362ced23
SSDEEP 768:cuq04JTLcsP8EWUmOTymo2qACLiE02FjMdjYkkmPIwzjbugX3iL2ypcRKBDZUx:cuqNJTLr62yL9wQPw3bRXSqBRUdUx
TLSH
T1A7231A0037E9812BF1BE4F7869F26245867EF5736603D54A1CC442DB5B23FC68A426EE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

xcavengon.click:80
xcavengon.click:22
xcavengon.click:8080
xcavengon.click:8880
xcavengon.click:2052
xcavengon.click:2082
xcavengon.click:2086
xcavengon.click:2095
xcavengon.click:443
xcavengon.click:2053
xcavengon.click:2083
xcavengon.click:2087
xcavengon.click:2096
xcavengon.click:8443
www.xcavengon.click:80
www.xcavengon.click:22
www.xcavengon.click:8080
www.xcavengon.click:8880
www.xcavengon.click:2052
www.xcavengon.click:2082
www.xcavengon.click:2086
www.xcavengon.click:2095
www.xcavengon.click:443
www.xcavengon.click:2053
www.xcavengon.click:2083
www.xcavengon.click:2087
www.xcavengon.click:2096
www.xcavengon.click:8443
revil.xcavengon.click:80
revil.xcavengon.click:22
revil.xcavengon.click:8080
revil.xcavengon.click:8880
revil.xcavengon.click:2052
revil.xcavengon.click:2082
revil.xcavengon.click:2086
revil.xcavengon.click:2095
revil.xcavengon.click:443
revil.xcavengon.click:2053
revil.xcavengon.click:2083
revil.xcavengon.click:2087
revil.xcavengon.click:2096
revil.xcavengon.click:8443
malware.xcavengon.click:80
malware.xcavengon.click:22
malware.xcavengon.click:8080
malware.xcavengon.click:8880
malware.xcavengon.click:2052
malware.xcavengon.click:2082
malware.xcavengon.click:2086
malware.xcavengon.click:2095
malware.xcavengon.click:443
malware.xcavengon.click:2053
malware.xcavengon.click:2083
malware.xcavengon.click:2087
malware.xcavengon.click:2096
malware.xcavengon.click:8443
client.xcavengon.click:80
client.xcavengon.click:22
client.xcavengon.click:8080
client.xcavengon.click:8880
client.xcavengon.click:2052
client.xcavengon.click:2082
client.xcavengon.click:2086
client.xcavengon.click:2095
client.xcavengon.click:443
client.xcavengon.click:2053
client.xcavengon.click:2083
client.xcavengon.click:2087
client.xcavengon.click:2096
client.xcavengon.click:8443
codered.xcavengon.click:80
codered.xcavengon.click:22
codered.xcavengon.click:8080
codered.xcavengon.click:8880
codered.xcavengon.click:2052
codered.xcavengon.click:2082
codered.xcavengon.click:2086
codered.xcavengon.click:2095
codered.xcavengon.click:443
codered.xcavengon.click:2053
codered.xcavengon.click:2083
codered.xcavengon.click:2087
codered.xcavengon.click:2096
codered.xcavengon.click:8443

Mutex

YAOGuY4182y0

Attributes

delay
0
install
true
install_file
7vo4.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 3 IoCs

rat

resource	yara_rule
behavioral1/files/0x0008000000024457-8.dat	family_asyncrat
behavioral1/memory/2068-10-0x0000000004BF0000-0x0000000004C00000-memory.dmp	family_asyncrat
behavioral1/memory/2068-13-0x0000000004BF0000-0x0000000004C00000-memory.dmp	family_asyncrat

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe

Executes dropped EXE 2 IoCs

pid	Process
2068	7vo4.exe
3848	7vo4.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2652	cmd.exe
4880	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	7vo4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
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	7vo4.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1548	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
1752	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
Token: SeDebugPrivilege	2068	7vo4.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2396 wrote to memory of 2652	2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe	86
PID 2396 wrote to memory of 4880	2396	667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe	88
PID 4880 wrote to memory of 1548	4880	cmd.exe	90
PID 2652 wrote to memory of 1752	2652	cmd.exe	91
PID 4880 wrote to memory of 3848	4880	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe
"C:\Users\Admin\AppData\Local\Temp\667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2396
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "7vo4" /tr '"C:\Users\Admin\AppData\Roaming\7vo4.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2652
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "7vo4" /tr '"C:\Users\Admin\AppData\Roaming\7vo4.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1752
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5109.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4880
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1548
- - C:\Users\Admin\AppData\Roaming\7vo4.exe
    "C:\Users\Admin\AppData\Roaming\7vo4.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3848

C:\Users\Admin\AppData\Roaming\7vo4.exe
"C:\Users\Admin\AppData\Roaming\7vo4.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2068

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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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tmp5109.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp5109.tmp.bat
Size 148B
SHA256 2b48c443f2710f4577de92e552171d2fb8849c5aa184a1b33f57cfa90217a527
MD5 260c2a461ddb7aa3d8b1f50fa3ae704e
SHA1 ff0d55a385263f39881ca63374757f37f10fc293
SHA512 cc0636c43428e78d017f784b08f71a48125614a2a663bb1a32dcec1b91a74112906ece55624d5b4ca0826e77babdef2de8f67fa248369b4137b2289bcb4f80c6
TLSH
T1B9C02B5255C7EA0E3805141306FAD99C9173FD1E3FC8FF40C304802E5381488F0D9341
MD5 SHA1 SHA512 TLSH

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7vo4.exe

Path C:\Users\Admin\AppData\Roaming\7vo4.exe
Size 45KB
SHA256 667abb4bbc41c248a6435609c59af2cdb3abbe3ae9a1e462357d8a256b8e2023
MD5 118e985c40df99d642cc8bbe5ed991db
SHA1 88fc038818cd272e4d0f0792a2142b4a262bcff1
SHA512 61d3604664b827616f03f9ccc453d0e8debc0ff1331fff6ec57e7f63cc86b0516d9343388bdc5226f91a2d491f7e4bae284319ad984251b4c67766dd362ced23
SSDEEP 768:cuq04JTLcsP8EWUmOTymo2qACLiE02FjMdjYkkmPIwzjbugX3iL2ypcRKBDZUx:cuqNJTLr62yL9wQPw3bRXSqBRUdUx
TLSH
T1A7231A0037E9812BF1BE4F7869F26245867EF5736603D54A1CC442DB5B23FC68A426EE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2068-10-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/2068-13-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/2396-0-0x0000000000950000-0x0000000000962000-memory.dmp

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memory/2396-1-0x0000000005410000-0x0000000005420000-memory.dmp

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memory/2396-2-0x0000000005310000-0x00000000053AC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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