asyncrat | 82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd

General

Target
82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
Size 45KB
Sample260804-h21kjsfa89
SHA256 82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd
MD5 fbde23d5eb5e2117d3f4df1fe19bf985
SHA1 198823ae3d886a5a933a1aacf74818ba1f52a4fc
SHA512 ebaa5c4c2b14d868d168e12a32935cd9c0d2c39f8cfa13fb781c3b81e5bbdeb2899e9d0b3ed941979afde990564f0debf52a9c75eab8072a4f5e892f3a299e76
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9m6R8aI6OPIXzjbUgz3iqVnXLes7YjWX+HBDZ8x:0u1YJTHcw2Z+Fb3X3b7zSkXLevje+hd+
TLSH
T15B232B0037E8822BF2BE4F78ADF26145867AF2673603D54E1CC4519B5613FC69A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

fimsexvietnam.com:80
fimsexvietnam.com:22
fimsexvietnam.com:8080
fimsexvietnam.com:8880
fimsexvietnam.com:2052
fimsexvietnam.com:2082
fimsexvietnam.com:2086
fimsexvietnam.com:2095
fimsexvietnam.com:443
fimsexvietnam.com:2053
fimsexvietnam.com:2083
fimsexvietnam.com:2087
fimsexvietnam.com:2096
fimsexvietnam.com:8443
www.fimsexvietnam.com:80
www.fimsexvietnam.com:22
www.fimsexvietnam.com:8080
www.fimsexvietnam.com:8880
www.fimsexvietnam.com:2052
www.fimsexvietnam.com:2082
www.fimsexvietnam.com:2086
www.fimsexvietnam.com:2095
www.fimsexvietnam.com:443
www.fimsexvietnam.com:2053
www.fimsexvietnam.com:2083
www.fimsexvietnam.com:2087
www.fimsexvietnam.com:2096
www.fimsexvietnam.com:8443
triton.fimsexvietnam.com:80
triton.fimsexvietnam.com:22
triton.fimsexvietnam.com:8080
triton.fimsexvietnam.com:8880
triton.fimsexvietnam.com:2052
triton.fimsexvietnam.com:2082
triton.fimsexvietnam.com:2086
triton.fimsexvietnam.com:2095
triton.fimsexvietnam.com:443
triton.fimsexvietnam.com:2053
triton.fimsexvietnam.com:2083
triton.fimsexvietnam.com:2087
triton.fimsexvietnam.com:2096
triton.fimsexvietnam.com:8443
formbook.fimsexvietnam.com:80
formbook.fimsexvietnam.com:22
formbook.fimsexvietnam.com:8080
formbook.fimsexvietnam.com:8880
formbook.fimsexvietnam.com:2052
formbook.fimsexvietnam.com:2082
formbook.fimsexvietnam.com:2086
formbook.fimsexvietnam.com:2095
formbook.fimsexvietnam.com:443
formbook.fimsexvietnam.com:2053
formbook.fimsexvietnam.com:2083
formbook.fimsexvietnam.com:2087
formbook.fimsexvietnam.com:2096
formbook.fimsexvietnam.com:8443

Mutex

SBxEXVrNdgY9

Attributes

delay
0
install
true
install_file
xfdazi.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/0x0002000000022b94-8.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	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe

Executes dropped EXE 2 IoCs

pid	Process
1280	xfdazi.exe
5132	xfdazi.exe

Outbound SSH connection to public host 2 TTPs 2 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc	pid	Process
SSH destination	62	172.67.182.173:22	1280	xfdazi.exe
SSH destination	63	104.21.36.7:22	1280	xfdazi.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
668	cmd.exe
3372	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	timeout.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	xfdazi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xfdazi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5240	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
3396	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
Token: SeDebugPrivilege	1280	xfdazi.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 668	1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe	87
PID 1672 wrote to memory of 3372	1672	82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe	89
PID 3372 wrote to memory of 5240	3372	cmd.exe	91
PID 668 wrote to memory of 3396	668	cmd.exe	92
PID 3372 wrote to memory of 5132	3372	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe
"C:\Users\Admin\AppData\Local\Temp\82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "xfdazi" /tr '"C:\Users\Admin\AppData\Roaming\xfdazi.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:668
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "xfdazi" /tr '"C:\Users\Admin\AppData\Roaming\xfdazi.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3396
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5ED4.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3372
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5240
- - C:\Users\Admin\AppData\Roaming\xfdazi.exe
    "C:\Users\Admin\AppData\Roaming\xfdazi.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:5132

C:\Users\Admin\AppData\Roaming\xfdazi.exe
"C:\Users\Admin\AppData\Roaming\xfdazi.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1280

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

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

1

T1572

Exfiltration

Impact

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Downloads

tmp5ED4.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp5ED4.tmp.bat
Size 150B
SHA256 2641e75627655bf1e36360ad823ddf6ffca25ba9808a32349355106e85c439c7
MD5 ec537037720899d36f30bcadf16bf152
SHA1 f2a6acf1b109b046fdccaa35bb882b70af5db7d4
SHA512 b71396c47e0c4309bc974b42418c15fab8511c2b1adb9d7543dd15fd9f919b3c93245a4ced6336c4c04917c055ebfb2755bd3281bc1c2ac2fdcd2bb2c614e572
TLSH
T1AEC08C4651C6AA8E2806145302BAD99CA566A91A3E40EB00C304440F6280848F499245
MD5 SHA1 SHA512 TLSH

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xfdazi.exe

Path C:\Users\Admin\AppData\Roaming\xfdazi.exe
Size 45KB
SHA256 82707a32c3c10254fc852e7d36c7072bfc825aac3b8dff83ad7084ec85f5d4bd
MD5 fbde23d5eb5e2117d3f4df1fe19bf985
SHA1 198823ae3d886a5a933a1aacf74818ba1f52a4fc
SHA512 ebaa5c4c2b14d868d168e12a32935cd9c0d2c39f8cfa13fb781c3b81e5bbdeb2899e9d0b3ed941979afde990564f0debf52a9c75eab8072a4f5e892f3a299e76
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9m6R8aI6OPIXzjbUgz3iqVnXLes7YjWX+HBDZ8x:0u1YJTHcw2Z+Fb3X3b7zSkXLevje+hd+
TLSH
T15B232B0037E8822BF2BE4F78ADF26145867AF2673603D54E1CC4519B5613FC69A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1280-10-0x0000000004F30000-0x0000000004F40000-memory.dmp

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memory/1280-13-0x0000000004F30000-0x0000000004F40000-memory.dmp

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memory/1672-0-0x0000000000040000-0x0000000000052000-memory.dmp

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memory/1672-1-0x0000000004AF0000-0x0000000004B00000-memory.dmp

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memory/1672-2-0x0000000004A20000-0x0000000004ABC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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