asyncrat | 416f9cc2cf7734fa757e4340c90c1b7fb4c41534067116e9c030a0d19ec589f8

General

Target
mb66.kids.exe
Size 56KB
Sample261002-j719psyflg
SHA256 416f9cc2cf7734fa757e4340c90c1b7fb4c41534067116e9c030a0d19ec589f8
MD5 addba8ceefd244a5f302812ac4ea1311
SHA1 175635d3fb0762cf31a9faa5637985dcfe1e23e9
SHA512 55e37e6700931ac26dc4fa73d1958487ab75aba7ad8bb060721c90788f76658ea4f6e31dfbe4ce1f2a1c2c8a09d9de043f5a56b26bbb88636285e1122d2e61dc
SSDEEP 1536:2uf09TH2w24aJgsY3bJXsJWAi63dNkejNUHLTq:2ufoTH2w2PgsY3bJwDkINmq
TLSH
T169436B003BE9822BF2BE4BB8A9F22141467AF2677603D55D1CC451CB5713BC6DA436FA
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

mb66.kids:443
mb66.kids:8848
mb66.kids:8080

Mutex

kBVPjakHQ19X

Attributes

delay
3
install
true
install_file
AsyncRat.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 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x0012000000024161-8.dat	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-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	mb66.kids.exe

Executes dropped EXE 2 IoCs

pid	Process
2124	AsyncRat.exe
4976	AsyncRat.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
2332	cmd.exe
2080	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	AsyncRat.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	AsyncRat.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	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	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mb66.kids.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1892	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
408	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe
2980	mb66.kids.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2980	mb66.kids.exe
Token: SeDebugPrivilege	2124	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2980 wrote to memory of 2332	2980	mb66.kids.exe	93
PID 2980 wrote to memory of 2080	2980	mb66.kids.exe	94
PID 2080 wrote to memory of 1892	2080	cmd.exe	97
PID 2332 wrote to memory of 408	2332	cmd.exe	98
PID 2080 wrote to memory of 4976	2080	cmd.exe	104

C:\Users\Admin\AppData\Local\Temp\mb66.kids.exe
"C:\Users\Admin\AppData\Local\Temp\mb66.kids.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2980
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2332
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:408
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp97E6.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2080
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1892
- - C:\Users\Admin\AppData\Roaming\AsyncRat.exe
    "C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4976

C:\Users\Admin\AppData\Roaming\AsyncRat.exe
"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2124

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

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp97E6.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp97E6.tmp.bat
Size 152B
SHA256 a6e95fe9a79554596b91ef2eab55b78aa2851e017dc835b1d691ac789888b922
MD5 9ba30b4dd6397114bdc3494fe2ec4d34
SHA1 497835dbc858c257c96671378ff4e61c40016f40
SHA512 5ae2b4c3ad3684ccab9722f7bdda13215160d17af536633657df9f732943a9fc1092ae353b4bd8696037fd7aeedcfa8b264fad21adddd15328cc922ef2790ae7
TLSH
T1B0C08C42A2C5AB1E3C05341312BA998C91666C993E40AB40C34844A9128054CE0E9341
MD5 SHA1 SHA512 TLSH

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AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 416f9cc2cf7734fa757e4340c90c1b7fb4c41534067116e9c030a0d19ec589f8
MD5 addba8ceefd244a5f302812ac4ea1311
SHA1 175635d3fb0762cf31a9faa5637985dcfe1e23e9
SHA512 55e37e6700931ac26dc4fa73d1958487ab75aba7ad8bb060721c90788f76658ea4f6e31dfbe4ce1f2a1c2c8a09d9de043f5a56b26bbb88636285e1122d2e61dc
SSDEEP 1536:2uf09TH2w24aJgsY3bJXsJWAi63dNkejNUHLTq:2ufoTH2w2PgsY3bJwDkINmq
TLSH
T169436B003BE9822BF2BE4BB8A9F22141467AF2677603D55D1CC451CB5713BC6DA436FA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2980-0-0x0000000000320000-0x0000000000334000-memory.dmp

Download

memory/2980-1-0x0000000004DF0000-0x0000000004E00000-memory.dmp

Download

memory/2980-2-0x0000000004D00000-0x0000000004D9C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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