asyncrat | 20059f985b4593f88335df1ce6c5d43fabeab5321467306bc28d06e231128b13

General

Target
m76.exe
Size 45KB
Sample260415-em2yaaet5p
SHA256 20059f985b4593f88335df1ce6c5d43fabeab5321467306bc28d06e231128b13
MD5 a9f033cce0da35a3bb41b0cd1fe8d36e
SHA1 3602fa1b4e414b750050602a25df8acf5bb6c86c
SHA512 7756bbb639475c268555c145d87c1a9d216a9305e1f3d11ef10781f8aecb3baa9a965290d545985be4b4ef317883d1f2cc7dd36d95d134eaf339c57ab96093f2
SSDEEP 768:huqw9T944nD5WUxjVDmo2qr+xuGJAIGYPPIjljbOgX3ibfqqT0NVGZ8dFBDZDx:huqw9T9xt2lANxjtbxXSbfOLdDx
TLSH
T165232C003BD9812BF2BF4F78ADF26145467AF2637603D5492CC442DB5613FC69A426EE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

vjfjxh.sa.com defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

vjfjxh.sa.com

C2

vjfjxh.sa.com:80
vjfjxh.sa.com:443
vjfjxh.sa.com:8080
vjfjxh.sa.com:8443
vjfjxh.sa.com:3306
https://vjfjxh.sa.com:80
https://vjfjxh.sa.com:443
https://vjfjxh.sa.com:8080
https://vjfjxh.sa.com:8443
https://vjfjxh.sa.com:3306

Mutex

Eb7WAfOZ8ywZ

Attributes

delay
3
install
true
install_file
m76.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/0x002100000002b20d-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
1176	m76.exe
2024	m76.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	m76.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m76.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m76.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3396	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
2904	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe
4968	m76.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4968	m76.exe
Token: SeDebugPrivilege	1176	m76.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4968 wrote to memory of 920	4968	m76.exe	80
PID 4968 wrote to memory of 3160	4968	m76.exe	82
PID 920 wrote to memory of 2904	920	cmd.exe	84
PID 3160 wrote to memory of 3396	3160	cmd.exe	85
PID 3160 wrote to memory of 2024	3160	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\m76.exe
"C:\Users\Admin\AppData\Local\Temp\m76.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4968
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "m76" /tr '"C:\Users\Admin\AppData\Roaming\m76.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:920
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "m76" /tr '"C:\Users\Admin\AppData\Roaming\m76.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2904
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2F39.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3160
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3396
- - C:\Users\Admin\AppData\Roaming\m76.exe
    "C:\Users\Admin\AppData\Roaming\m76.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2024

C:\Users\Admin\AppData\Roaming\m76.exe
"C:\Users\Admin\AppData\Roaming\m76.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1176

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

m76.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\m76.exe.log
Size 522B
SHA256 3a8c487575696f7ace931dc220c85a47d33e0ead96aa9e47c705fee5dfac667a
MD5 db9f45365506c49961bfaf3be1475ad2
SHA1 6bd7222f7b7e3e9685207cb285091c92728168e4
SHA512 807028e2aed5b25b2d19ec4f09867746456de4e506c90c73e6730b35303511349a79ca0b9290509664edc0433d47e3fc7f2661534293ebb82185b1494da86a41
TLSH
T10DF09E303231B1D848023F42181C7A8942EF0746B7B8DF2D3650231EDC350176F212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp2F39.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp2F39.tmp.bat
Size 147B
SHA256 9f933c0f1a5058b961a8da21ce6ef287e9dfd934ac7b9ac06b6867bdcca35bc6
MD5 d3dc2d6ab5d3e8d239ab50829c9e63c0
SHA1 13c329848bc784ff064ddecfe7e9a4767deb4d52
SHA512 8e2099cec4885efc0a6c39f45ff0ff9da954d833e00604617e44de2ec10764bad3130e4c77a3b653fb04d98a0a1366ffd93d2155c5cf8c14d58dc2174e4f69ae
TLSH
T1E2C02B43A6C6EA5E3806241302FAD88CF2736C1E3F40BB00D304400D1280448F0FD381
MD5 SHA1 SHA512 TLSH

Submit Download

m76.exe

Path C:\Users\Admin\AppData\Roaming\m76.exe
Size 45KB
SHA256 20059f985b4593f88335df1ce6c5d43fabeab5321467306bc28d06e231128b13
MD5 a9f033cce0da35a3bb41b0cd1fe8d36e
SHA1 3602fa1b4e414b750050602a25df8acf5bb6c86c
SHA512 7756bbb639475c268555c145d87c1a9d216a9305e1f3d11ef10781f8aecb3baa9a965290d545985be4b4ef317883d1f2cc7dd36d95d134eaf339c57ab96093f2
SSDEEP 768:huqw9T944nD5WUxjVDmo2qr+xuGJAIGYPPIjljbOgX3ibfqqT0NVGZ8dFBDZDx:huqw9T9xt2lANxjtbxXSbfOLdDx
TLSH
T165232C003BD9812BF2BF4F78ADF26145467AF2637603D5492CC442DB5613FC69A426EE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1176-13-0x00000000027E0000-0x00000000027EB000-memory.dmp

Download

memory/2024-12-0x0000000002C50000-0x0000000002C5B000-memory.dmp

Download

memory/4968-0-0x0000000000DB0000-0x0000000000DC2000-memory.dmp

Download

memory/4968-1-0x00000000058E0000-0x00000000058F0000-memory.dmp

Download

memory/4968-2-0x0000000005830000-0x00000000058CC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads