asyncrat | 547f2854f803d29595baf6089f8b2df9152dcf9174e25fcafdcd154df82784f3

General

Target
buid.exe
Size 48KB
Sample260727-wbb16axgra
SHA256 547f2854f803d29595baf6089f8b2df9152dcf9174e25fcafdcd154df82784f3
MD5 d4cb0667d61a55c478410f0903e32100
SHA1 e7bcfb78d8d6e8cecc39c9c15221de7dc919836a
SHA512 7f790dabfebfebca2af6ab6aa07455775fed1640cc2349ef8e1d5e5640e778c7189fdfa32ed4988e13939de5e70201688f62255c105b53cd10c93448b2c881c0
SSDEEP 768:ya3M5L2aKjxvRwRGgx8sm2gEJKlJ9DA1P9Jl9wF0bF5/VB/aatCf1bhXArqmM5bG:ya3M5DWgJ6DA9zbFJuaA1lXA/M5bHf+
TLSH
T178233C003BEDC12AF2BE4F7899F22255857AF6633607D65D1C8801DB5A13FC28A416FD
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

phimsexvn69.com:8004
phimsexvn69.com:8005
phimsexvn69.com:7600
phimsexvn69.com:7601
phimsexvn69.com:7602
phimsexvn69.com:7603
www.phimsexvn69.com:8004
www.phimsexvn69.com:8005
www.phimsexvn69.com:7600
www.phimsexvn69.com:7601
www.phimsexvn69.com:7602
www.phimsexvn69.com:7603
NotPetya.phimsexvn69.com:8004
NotPetya.phimsexvn69.com:8005
NotPetya.phimsexvn69.com:7600
NotPetya.phimsexvn69.com:7601
NotPetya.phimsexvn69.com:7602
NotPetya.phimsexvn69.com:7603
Stuxnet.phimsexvn69.com:8004
Stuxnet.phimsexvn69.com:8005
Stuxnet.phimsexvn69.com:7600
Stuxnet.phimsexvn69.com:7601
Stuxnet.phimsexvn69.com:7602
Stuxnet.phimsexvn69.com:7603
Zeus.phimsexvn69.com:8004
Zeus.phimsexvn69.com:8005
Zeus.phimsexvn69.com:7600
Zeus.phimsexvn69.com:7601
Zeus.phimsexvn69.com:7602
Zeus.phimsexvn69.com:7603
CryptoLocker.phimsexvn69.com:8004
CryptoLocker.phimsexvn69.com:8005
CryptoLocker.phimsexvn69.com:7600
CryptoLocker.phimsexvn69.com:7601
CryptoLocker.phimsexvn69.com:7602
CryptoLocker.phimsexvn69.com:7603

Mutex

BxPBDH8ecZDl

Attributes

delay
3
install
true
install_file
buid.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/0x0008000000024435-8.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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	buid.exe

Executes dropped EXE 2 IoCs

pid	Process
2196	buid.exe
2068	buid.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
5092	cmd.exe
2948	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	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	buid.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buid.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buid.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4568	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
2496	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe
552	buid.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	552	buid.exe
Token: SeDebugPrivilege	2196	buid.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 552 wrote to memory of 2948	552	buid.exe	86
PID 552 wrote to memory of 5092	552	buid.exe	88
PID 5092 wrote to memory of 4568	5092	cmd.exe	90
PID 2948 wrote to memory of 2496	2948	cmd.exe	91
PID 5092 wrote to memory of 2068	5092	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\buid.exe
"C:\Users\Admin\AppData\Local\Temp\buid.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:552
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "buid" /tr '"C:\Users\Admin\AppData\Roaming\buid.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2948
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "buid" /tr '"C:\Users\Admin\AppData\Roaming\buid.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2496
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5290.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5092
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4568
- - C:\Users\Admin\AppData\Roaming\buid.exe
    "C:\Users\Admin\AppData\Roaming\buid.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2068

C:\Users\Admin\AppData\Roaming\buid.exe
"C:\Users\Admin\AppData\Roaming\buid.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2196

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

buid.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\buid.exe.log
Size 522B
SHA256 2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b
MD5 acc9090417037dfa2a55b46ed86e32b8
SHA1 53fa6fb25fb3e88c24d2027aca6ae492b2800a4d
SHA512 d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b
TLSH
T11EF097303722E1E489423F521C1C3A9943EF079AA360EE2C3958036ED825227AB212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp5290.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp5290.tmp.bat
Size 148B
SHA256 94654d9b2e745a48b1b6265fc889c63e06a822ed6f3d23625b82d20e8007dac6
MD5 1a91b90382853630511451227140e85a
SHA1 49af026d6fc5d0ab8bbb1e18ed833e2ccf347bc1
SHA512 3c02c1a512c3f7f0ca6c4b9b9d8e38507cf7e01ab30b6b6775bc72bfc3053e56e80dfbe828d92a2f2f0c2a8b6425ec9a431b66b7bfa9f8e2eee494ce6aadbc05
TLSH
T13BC02B4251C5FE0F2805146307FADDCC91726C2E3F40FB00C304400F128044DF8D9345
MD5 SHA1 SHA512 TLSH

Submit Download

buid.exe

Path C:\Users\Admin\AppData\Roaming\buid.exe
Size 48KB
SHA256 547f2854f803d29595baf6089f8b2df9152dcf9174e25fcafdcd154df82784f3
MD5 d4cb0667d61a55c478410f0903e32100
SHA1 e7bcfb78d8d6e8cecc39c9c15221de7dc919836a
SHA512 7f790dabfebfebca2af6ab6aa07455775fed1640cc2349ef8e1d5e5640e778c7189fdfa32ed4988e13939de5e70201688f62255c105b53cd10c93448b2c881c0
SSDEEP 768:ya3M5L2aKjxvRwRGgx8sm2gEJKlJ9DA1P9Jl9wF0bF5/VB/aatCf1bhXArqmM5bG:ya3M5DWgJ6DA9zbFJuaA1lXA/M5bHf+
TLSH
T178233C003BEDC12AF2BE4F7899F22255857AF6633607D65D1C8801DB5A13FC28A416FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/552-0-0x0000000000E80000-0x0000000000E92000-memory.dmp

Download

memory/552-1-0x00000000057C0000-0x00000000057D0000-memory.dmp

Download

memory/552-2-0x0000000005870000-0x000000000590C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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