asyncrat | 6e4fab8f630c6a82812d1aa604df63a5cd7e6dea9706556c29e4c04bd558cb6b

General

Target
tmph6cquyx7.exe
Size 45KB
Sample260602-klt4yaav3m
SHA256 6e4fab8f630c6a82812d1aa604df63a5cd7e6dea9706556c29e4c04bd558cb6b
MD5 ee27d0d5bc1f59c61bfe7ba8d5ee8319
SHA1 7390713e16005c81024fefa52286920f219db4c0
SHA512 e0e7291fcbe7158e8309d2f2189c68797b5c88ce48e812a752c463b63571dceb5ca83ea7704e3ca5dcf7ba89eb5f2ca25fc041979929a5b3517f7ce631668fb5
SSDEEP 768:puNA/9T85LafWUzvSdmo2qIEK1YJBOPIxq7zjbLgG3i6cj63jhxBBBz/3BDZ7x:puNA/9T8p72/iz3xS3b0GSfjajFpd7x
TLSH
T1F2232C0037E8822BF2BE4F7899F26105467AF6673603D58D1CC452DB5613FC68A52AFE
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

mygraded.co.uk:443
mygraded.co.uk:80
mygraded.co.uk:7797
mygraded.co.uk:8707
mygraded.co.uk:6620
www.mygraded.co.uk:443
www.mygraded.co.uk:80
www.mygraded.co.uk:7797
www.mygraded.co.uk:8707
www.mygraded.co.uk:6620
ursnif.mygraded.co.uk:443
ursnif.mygraded.co.uk:80
ursnif.mygraded.co.uk:7797
ursnif.mygraded.co.uk:8707
ursnif.mygraded.co.uk:6620
mirai.mygraded.co.uk:443
mirai.mygraded.co.uk:80
mirai.mygraded.co.uk:7797
mirai.mygraded.co.uk:8707
mirai.mygraded.co.uk:6620

Mutex

oafFB6abMrfW

Attributes

delay
0
install
true
install_file
aos23m.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
behavioral2/files/0x0002000000022cb9-8.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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	tmph6cquyx7.exe

Executes dropped EXE 2 IoCs

pid	Process
4336	aos23m.exe
3676	aos23m.exe

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 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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aos23m.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aos23m.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmph6cquyx7.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	schtasks.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5140	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
6076	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe
2524	tmph6cquyx7.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2524	tmph6cquyx7.exe
Token: SeDebugPrivilege	4336	aos23m.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2524 wrote to memory of 5044	2524	tmph6cquyx7.exe	89
PID 2524 wrote to memory of 2364	2524	tmph6cquyx7.exe	91
PID 5044 wrote to memory of 6076	5044	cmd.exe	93
PID 2364 wrote to memory of 5140	2364	cmd.exe	94
PID 2364 wrote to memory of 3676	2364	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\tmph6cquyx7.exe
"C:\Users\Admin\AppData\Local\Temp\tmph6cquyx7.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2524
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "aos23m" /tr '"C:\Users\Admin\AppData\Roaming\aos23m.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5044
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "aos23m" /tr '"C:\Users\Admin\AppData\Roaming\aos23m.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:6076
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA5B.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2364
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5140
- - C:\Users\Admin\AppData\Roaming\aos23m.exe
    "C:\Users\Admin\AppData\Roaming\aos23m.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3676

C:\Users\Admin\AppData\Roaming\aos23m.exe
"C:\Users\Admin\AppData\Roaming\aos23m.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4336

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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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Downloads

tmpA5B.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpA5B.tmp.bat
Size 149B
SHA256 31b978f0a72ab443695f5a77d151b3d4926f157728074af79930490a1802465a
MD5 c81aac357eb61e482f8cd11d1e4de42b
SHA1 33eaf7709330b7ce6bea9639a867c668b0f2e0da
SHA512 4cb632e80d8bdd4db262ad239a218c2c4aa2c9a1d54dc6e60d47be7d7c2d7415869826155b1c22dbe92b5315522c914741d55692d94988c20bcb3b92fbbdfbc7
TLSH
T1E0C02B4296C9EAAE7A05941302FFD49D91726D1D3F48FB00D388400D138185DF1D9341
MD5 SHA1 SHA512 TLSH

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aos23m.exe

Path C:\Users\Admin\AppData\Roaming\aos23m.exe
Size 45KB
SHA256 6e4fab8f630c6a82812d1aa604df63a5cd7e6dea9706556c29e4c04bd558cb6b
MD5 ee27d0d5bc1f59c61bfe7ba8d5ee8319
SHA1 7390713e16005c81024fefa52286920f219db4c0
SHA512 e0e7291fcbe7158e8309d2f2189c68797b5c88ce48e812a752c463b63571dceb5ca83ea7704e3ca5dcf7ba89eb5f2ca25fc041979929a5b3517f7ce631668fb5
SSDEEP 768:puNA/9T85LafWUzvSdmo2qIEK1YJBOPIxq7zjbLgG3i6cj63jhxBBBz/3BDZ7x:puNA/9T8p72/iz3xS3b0GSfjajFpd7x
TLSH
T1F2232C0037E8822BF2BE4F7899F26105467AF6673603D58D1CC452DB5613FC68A52AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2524-0-0x0000000000A90000-0x0000000000AA2000-memory.dmp

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memory/2524-1-0x00000000054E0000-0x00000000054F0000-memory.dmp

Download

memory/2524-2-0x00000000054F0000-0x000000000558C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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