asyncrat | fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa

General

Target
fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
Size 45KB
Sample260804-whe2dswfne
SHA256 fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa
MD5 e48d265037635923eba6aefe11d001ac
SHA1 03cda4ef0a59e9ff0b42b2afc60d27f8c48ef34b
SHA512 f46440c9e76f92a9e3703487f8bea229ff7c64872d535d232517eefd7a89637130f104895d9119c8387b742bd1c9c1d2851616c772be78785a0ced02904249cf
SSDEEP 768:RuxkJTVmU5EkWUGMKSmo2q1E+GtCVnJtHuPI+zjbMgX3iqo86+6PZBDZcx:RuxkJTgip2v+TB3+3bDXSj+6Pdcx
TLSH
T13A231A003BE8822BF2BE4FB899F25145467AF5636603D5492CC452DB5723FC6CA426FD
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

vnsextop1.com:80
vnsextop1.com:22
vnsextop1.com:8080
vnsextop1.com:8880
vnsextop1.com:2052
vnsextop1.com:2082
vnsextop1.com:2086
vnsextop1.com:2095
vnsextop1.com:443
vnsextop1.com:2053
vnsextop1.com:2083
vnsextop1.com:2087
vnsextop1.com:2096
vnsextop1.com:8443
www.vnsextop1.com:80
www.vnsextop1.com:22
www.vnsextop1.com:8080
www.vnsextop1.com:8880
www.vnsextop1.com:2052
www.vnsextop1.com:2082
www.vnsextop1.com:2086
www.vnsextop1.com:2095
www.vnsextop1.com:443
www.vnsextop1.com:2053
www.vnsextop1.com:2083
www.vnsextop1.com:2087
www.vnsextop1.com:2096
www.vnsextop1.com:8443
emotet.vnsextop1.com:80
emotet.vnsextop1.com:22
emotet.vnsextop1.com:8080
emotet.vnsextop1.com:8880
emotet.vnsextop1.com:2052
emotet.vnsextop1.com:2082
emotet.vnsextop1.com:2086
emotet.vnsextop1.com:2095
emotet.vnsextop1.com:443
emotet.vnsextop1.com:2053
emotet.vnsextop1.com:2083
emotet.vnsextop1.com:2087
emotet.vnsextop1.com:2096
emotet.vnsextop1.com:8443
triton.vnsextop1.com:80
triton.vnsextop1.com:22
triton.vnsextop1.com:8080
triton.vnsextop1.com:8880
triton.vnsextop1.com:2052
triton.vnsextop1.com:2082
triton.vnsextop1.com:2086
triton.vnsextop1.com:2095
triton.vnsextop1.com:443
triton.vnsextop1.com:2053
triton.vnsextop1.com:2083
triton.vnsextop1.com:2087
triton.vnsextop1.com:2096
triton.vnsextop1.com:8443

Mutex

sQHxYkaboKRm

Attributes

delay
0
install
true
install_file
cdz4xrcf.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 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x0008000000024432-8.dat	family_asyncrat
behavioral1/memory/2236-10-0x00000000053E0000-0x00000000053F0000-memory.dmp	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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe

Executes dropped EXE 2 IoCs

pid	Process
2236	cdz4xrcf.exe
4876	cdz4xrcf.exe

Outbound SSH connection to public host 2 TTPs 1 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	76	175.110.122.12:22	2236	cdz4xrcf.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
4640	cmd.exe
4880	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cdz4xrcf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cdz4xrcf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3416	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
1748	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
Token: SeDebugPrivilege	2236	cdz4xrcf.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2520 wrote to memory of 4640	2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe	86
PID 2520 wrote to memory of 4880	2520	fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe	88
PID 4880 wrote to memory of 3416	4880	cmd.exe	90
PID 4640 wrote to memory of 1748	4640	cmd.exe	91
PID 4880 wrote to memory of 4876	4880	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe
"C:\Users\Admin\AppData\Local\Temp\fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2520
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "cdz4xrcf" /tr '"C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4640
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "cdz4xrcf" /tr '"C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1748
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2C89.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4880
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3416
- - C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe
    "C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4876

C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe
"C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2236

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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tmp2C89.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp2C89.tmp.bat
Size 152B
SHA256 29ab830dfd5f0ea392b272e2e25e0039f8deb27196ded29c103217c0e9283616
MD5 1a9cad8dff868151324451a338f836f2
SHA1 34f084fe20eaaac3e29a856fd09da44474abf971
SHA512 27ea5a1c64584b99d1137dc27fd41d1b8c63a6e5dcf6d58c6314c52d93e2e034e24d5b1c877495303f13e980a794c412e53d95fd5a41ca7f1fb62422e1b32b96
TLSH
T1BBC02B8271C7EE1E3905141306FEE8CDE1B26C2A3F40BF10C704480E6680848F8D93C6
MD5 SHA1 SHA512 TLSH

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cdz4xrcf.exe

Path C:\Users\Admin\AppData\Roaming\cdz4xrcf.exe
Size 45KB
SHA256 fbeb29143a6a63aa61ecf57fef1e87ed2fbb40c005321ca2c1c99f63d7152efa
MD5 e48d265037635923eba6aefe11d001ac
SHA1 03cda4ef0a59e9ff0b42b2afc60d27f8c48ef34b
SHA512 f46440c9e76f92a9e3703487f8bea229ff7c64872d535d232517eefd7a89637130f104895d9119c8387b742bd1c9c1d2851616c772be78785a0ced02904249cf
SSDEEP 768:RuxkJTVmU5EkWUGMKSmo2q1E+GtCVnJtHuPI+zjbMgX3iqo86+6PZBDZcx:RuxkJTgip2v+TB3+3bDXSj+6Pdcx
TLSH
T13A231A003BE8822BF2BE4FB899F25145467AF5636603D5492CC452DB5723FC6CA426FD
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2236-10-0x00000000053E0000-0x00000000053F0000-memory.dmp

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memory/2236-13-0x00000000053E0000-0x00000000053F0000-memory.dmp

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memory/2520-0-0x0000000000990000-0x00000000009A2000-memory.dmp

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memory/2520-1-0x00000000051D0000-0x00000000051E0000-memory.dmp

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memory/2520-2-0x0000000005280000-0x000000000531C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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