asyncrat | 4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa

General

Target
4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
Size 45KB
Sample260821-sa685ascnd
SHA256 4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa
MD5 5ac6dfca2716d44914cfa69feda045bf
SHA1 48a513f2f35375602501c2494187fc37aa7c30f7
SHA512 73e78f14ea427d3cae04cb4c0c0f035e1137602f303bd5c906d49d790bad16d00385e80f35b4deff18fa18aea153b1cfe7746665ef244ff969861bdfff2615eb
SSDEEP 768:0u2vpTD4U2ieWUsqfAmo2qj+oopCBK9INJPIZzjb+gX3i9GBzBeDSUmjXQioCdBM:0u2vpTDe+2do6bIwZ3bBXS9OzBCSUdio
TLSH
T100232B003BE8C12BF2BE5F7499F26145467AF6632603D54E2CC412DB5613FC69A42AFE
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

e.streamforester.name:80
e.streamforester.name:22
e.streamforester.name:8080
e.streamforester.name:8880
e.streamforester.name:2052
e.streamforester.name:2082
e.streamforester.name:2086
e.streamforester.name:2095
e.streamforester.name:443
e.streamforester.name:2053
e.streamforester.name:2083
e.streamforester.name:2087
e.streamforester.name:2096
e.streamforester.name:8443
www.e.streamforester.name:80
www.e.streamforester.name:22
www.e.streamforester.name:8080
www.e.streamforester.name:8880
www.e.streamforester.name:2052
www.e.streamforester.name:2082
www.e.streamforester.name:2086
www.e.streamforester.name:2095
www.e.streamforester.name:443
www.e.streamforester.name:2053
www.e.streamforester.name:2083
www.e.streamforester.name:2087
www.e.streamforester.name:2096
www.e.streamforester.name:8443
darkside.e.streamforester.name:80
darkside.e.streamforester.name:22
darkside.e.streamforester.name:8080
darkside.e.streamforester.name:8880
darkside.e.streamforester.name:2052
darkside.e.streamforester.name:2082
darkside.e.streamforester.name:2086
darkside.e.streamforester.name:2095
darkside.e.streamforester.name:443
darkside.e.streamforester.name:2053
darkside.e.streamforester.name:2083
darkside.e.streamforester.name:2087
darkside.e.streamforester.name:2096
darkside.e.streamforester.name:8443
klez.e.streamforester.name:80
klez.e.streamforester.name:22
klez.e.streamforester.name:8080
klez.e.streamforester.name:8880
klez.e.streamforester.name:2052
klez.e.streamforester.name:2082
klez.e.streamforester.name:2086
klez.e.streamforester.name:2095
klez.e.streamforester.name:443
klez.e.streamforester.name:2053
klez.e.streamforester.name:2083
klez.e.streamforester.name:2087
klez.e.streamforester.name:2096
klez.e.streamforester.name:8443
client.e.streamforester.name:80
client.e.streamforester.name:22
client.e.streamforester.name:8080
client.e.streamforester.name:8880
client.e.streamforester.name:2052
client.e.streamforester.name:2082
client.e.streamforester.name:2086
client.e.streamforester.name:2095
client.e.streamforester.name:443
client.e.streamforester.name:2053
client.e.streamforester.name:2083
client.e.streamforester.name:2087
client.e.streamforester.name:2096
client.e.streamforester.name:8443

Mutex

tOHlVz7x2rcC

Attributes

delay
0
install
true
install_file
24n9urv.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/0x0008000000024571-8.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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe

Executes dropped EXE 2 IoCs

pid	Process
3988	24n9urv.exe
3492	24n9urv.exe

Outbound SSH connection to public host 2 TTPs 5 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	61	172.67.70.147:22	3988	24n9urv.exe
SSH destination	12	104.26.5.5:22	3988	24n9urv.exe
SSH destination	17	104.26.4.5:22	3988	24n9urv.exe
SSH destination	20	172.67.70.147:22	3988	24n9urv.exe
SSH destination	57	104.26.5.5:22	3988	24n9urv.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
2564	cmd.exe
1228	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	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	24n9urv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	24n9urv.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
380	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
804	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
Token: SeDebugPrivilege	3988	24n9urv.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2332 wrote to memory of 1228	2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe	85
PID 2332 wrote to memory of 2564	2332	4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe	87
PID 2564 wrote to memory of 380	2564	cmd.exe	89
PID 1228 wrote to memory of 804	1228	cmd.exe	90
PID 2564 wrote to memory of 3492	2564	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe
"C:\Users\Admin\AppData\Local\Temp\4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2332
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "24n9urv" /tr '"C:\Users\Admin\AppData\Roaming\24n9urv.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1228
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "24n9urv" /tr '"C:\Users\Admin\AppData\Roaming\24n9urv.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:804
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp97.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2564
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:380
- - C:\Users\Admin\AppData\Roaming\24n9urv.exe
    "C:\Users\Admin\AppData\Roaming\24n9urv.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3492

C:\Users\Admin\AppData\Roaming\24n9urv.exe
"C:\Users\Admin\AppData\Roaming\24n9urv.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3988

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

tmp97.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp97.tmp.bat
Size 149B
SHA256 dfeff7226df9e4a274d77f7ad582c587296e3df2d3d3009c6280f72c80e4ec0d
MD5 b7d4383e410ef9b9eb7faaa410c41dac
SHA1 bc196d8559e7a58e6f1b566b1eebd94a15d6b98b
SHA512 0cf13a101204fbddb9dd6a243deffc3082e7e921028a81708c15fe780a5e32a5e4a6d928a9517a6cf4f3b972d10fb9d486570c03efc697cec6e1b05ee2704d0f
TLSH
T1C3C02B9352C5EA0F2806241302FED99CA2727C6D3F40BF00C304800D128044CF0D9345
MD5 SHA1 SHA512 TLSH

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24n9urv.exe

Path C:\Users\Admin\AppData\Roaming\24n9urv.exe
Size 45KB
SHA256 4652fb01feff52c38002dc70f6183f2f9d9d8a97a25cb1b3796bb231613c6efa
MD5 5ac6dfca2716d44914cfa69feda045bf
SHA1 48a513f2f35375602501c2494187fc37aa7c30f7
SHA512 73e78f14ea427d3cae04cb4c0c0f035e1137602f303bd5c906d49d790bad16d00385e80f35b4deff18fa18aea153b1cfe7746665ef244ff969861bdfff2615eb
SSDEEP 768:0u2vpTD4U2ieWUsqfAmo2qj+oopCBK9INJPIZzjb+gX3i9GBzBeDSUmjXQioCdBM:0u2vpTDe+2do6bIwZ3bBXS9OzBCSUdio
TLSH
T100232B003BE8C12BF2BE5F7499F26145467AF6632603D54E2CC412DB5613FC69A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2332-0-0x0000000000BE0000-0x0000000000BF2000-memory.dmp

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memory/2332-1-0x00000000055E0000-0x00000000055F0000-memory.dmp

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memory/2332-2-0x00000000055F0000-0x000000000568C000-memory.dmp

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memory/3988-10-0x0000000004B10000-0x0000000004B20000-memory.dmp

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memory/3988-13-0x0000000004B10000-0x0000000004B20000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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