asyncrat | 7955bbdc1d94038940aa37a41a218869f1d301092d363930ad2f17b512d8a386

General

Target
MiraiBot.exe
Size 47KB
Sample260831-va3l2sdl21
SHA256 7955bbdc1d94038940aa37a41a218869f1d301092d363930ad2f17b512d8a386
MD5 400efa5f4a9df220b82c767f10bfc376
SHA1 c81143ef85000dde0daeb5d211a0328356a76962
SHA512 b0bd0a3c679ca137a13227d888ddbf3c952112e25bd775c9913fca4958069f6d1e66663a7de5a598375306ab6abb2a594b7c50231463a6c0f1fe494032e27cdd
SSDEEP 768:UuIHdTYEXlTWU/+qhmo2qb60lNMWiAXau8/14xIPIEaPWYj40b+O4OypuLlItM0P:UuIHdTYUN2ON9Xav/q7Ea+YPb+1pKvoF
TLSH
T12A232C003BE9822BF2BE5F7499F26245867BB2637603D54D2CC451D75B13BC28A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

vdubprint.co defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

vdubprint.co

C2

vdubprint.co:80
vdubprint.co:8080
vdubprint.co:443
vdubprint.co:8443
vdubprint.co:22
vdubprint.co:23
vdubprint.co:6606
vdubprint.co:5555

Mutex

p7dK7XgHckO8

Attributes

delay
3
install
true
install_file
GoogleUpdate.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/0x000300000001da0a-9.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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	MiraiBot.exe

Executes dropped EXE 2 IoCs

pid	Process
3200	GoogleUpdate.exe
3364	GoogleUpdate.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
1380	cmd.exe
3328	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	GoogleUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GoogleUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MiraiBot.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
768	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
4724	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe
1228	MiraiBot.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1228	MiraiBot.exe
Token: SeDebugPrivilege	3200	GoogleUpdate.exe
Token: SeDebugPrivilege	3200	GoogleUpdate.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1228 wrote to memory of 1380	1228	MiraiBot.exe	90
PID 1228 wrote to memory of 3328	1228	MiraiBot.exe	92
PID 3328 wrote to memory of 768	3328	cmd.exe	94
PID 1380 wrote to memory of 4724	1380	cmd.exe	95
PID 3328 wrote to memory of 3364	3328	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\MiraiBot.exe
"C:\Users\Admin\AppData\Local\Temp\MiraiBot.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1228
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1380
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4724
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8F0C.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3328
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:768
- - C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
    "C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3364

C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3200

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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Downloads

tmp8F0C.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp8F0C.tmp.bat
Size 156B
SHA256 3fae7795b207f329ee0d5917f01dc6f8cbfccad782fc23cd1087c76249be1d76
MD5 47b1fe2ad7cb318454690fc2af527268
SHA1 e3b433b3f07220f60bbf4be36ad92d7f8819e4bf
SHA512 315195f17ec1cc671c0215e3c319c26ab6c904dbc06e1a65ae1206fbd9361d9465bef3680812e6c1df57de4cf6259137c5c3d3b322a5476d01b7f80dade9d9e2
TLSH
T102C02B5361C9EA1F2805E82713FED4CD91B6BC593F45FB00C304841D22C0888F4ED382
MD5 SHA1 SHA512 TLSH

Submit Download

GoogleUpdate.exe

Path C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
Size 47KB
SHA256 7955bbdc1d94038940aa37a41a218869f1d301092d363930ad2f17b512d8a386
MD5 400efa5f4a9df220b82c767f10bfc376
SHA1 c81143ef85000dde0daeb5d211a0328356a76962
SHA512 b0bd0a3c679ca137a13227d888ddbf3c952112e25bd775c9913fca4958069f6d1e66663a7de5a598375306ab6abb2a594b7c50231463a6c0f1fe494032e27cdd
SSDEEP 768:UuIHdTYEXlTWU/+qhmo2qb60lNMWiAXau8/14xIPIEaPWYj40b+O4OypuLlItM0P:UuIHdTYUN2ON9Xav/q7Ea+YPb+1pKvoF
TLSH
T12A232C003BE9822BF2BE5F7499F26245867BB2637603D54D2CC451D75B13BC28A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1228-0-0x0000000000F10000-0x0000000000F22000-memory.dmp

Download

memory/1228-1-0x0000000005990000-0x00000000059A0000-memory.dmp

Download

memory/1228-2-0x00000000058D0000-0x0000000005936000-memory.dmp

Download

memory/1228-3-0x0000000005D40000-0x0000000005DDC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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