asyncrat | b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9

Analysis

max time kernel
148s
max time network
154s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
16/08/2026, 07:43

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General

Target
b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
Size 45KB
Sample260816-jklwhafn21
SHA256 b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9
MD5 30cfd0bb8fc44a20e7710d0c058a435d
SHA1 cc5268e0834d3cbbf28db51d9cc232ec3c411f67
SHA512 739f1766be5ae06778b5c5092bba7d19e28123f7f2910e0804fc044cf33d3df1839432cd67bc2a2d4a3295fdd1fac84821328700c23ee7888c733a7ab6a9ee5f
SSDEEP 768:cuqb5TrIGuCWUoKXMmo2qQ0fBohEaEPIQ2jbxgX3iM9Wxz4a7plUBDZUx:cuqb5TrhG2a4EapQ6b+XSMUxzf7bidUx
TLSH
T155232A003BE88127F2BE4F78A9F26145867AF6632603D58A1CC411DB5713FC6DA526FE
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

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
melissa.e.streamforester.name:80
melissa.e.streamforester.name:22
melissa.e.streamforester.name:8080
melissa.e.streamforester.name:8880
melissa.e.streamforester.name:2052
melissa.e.streamforester.name:2082
melissa.e.streamforester.name:2086
melissa.e.streamforester.name:2095
melissa.e.streamforester.name:443
melissa.e.streamforester.name:2053
melissa.e.streamforester.name:2083
melissa.e.streamforester.name:2087
melissa.e.streamforester.name:2096
melissa.e.streamforester.name:8443
notpetya.e.streamforester.name:80
notpetya.e.streamforester.name:22
notpetya.e.streamforester.name:8080
notpetya.e.streamforester.name:8880
notpetya.e.streamforester.name:2052
notpetya.e.streamforester.name:2082
notpetya.e.streamforester.name:2086
notpetya.e.streamforester.name:2095
notpetya.e.streamforester.name:443
notpetya.e.streamforester.name:2053
notpetya.e.streamforester.name:2083
notpetya.e.streamforester.name:2087
notpetya.e.streamforester.name:2096
notpetya.e.streamforester.name:8443
ryuk.e.streamforester.name:80
ryuk.e.streamforester.name:22
ryuk.e.streamforester.name:8080
ryuk.e.streamforester.name:8880
ryuk.e.streamforester.name:2052
ryuk.e.streamforester.name:2082
ryuk.e.streamforester.name:2086
ryuk.e.streamforester.name:2095
ryuk.e.streamforester.name:443
ryuk.e.streamforester.name:2053
ryuk.e.streamforester.name:2083
ryuk.e.streamforester.name:2087
ryuk.e.streamforester.name:2096
ryuk.e.streamforester.name:8443

Mutex

TELvHooBKPBd

Attributes

delay
0
install
true
install_file
oubr9.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/0x000e00000001c55b-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
1700	oubr9.exe
5888	oubr9.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
SSH destination	14	172.67.70.147:22
SSH destination	15	104.26.5.5:22

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
4844	cmd.exe
4180	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	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.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	oubr9.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	oubr9.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
6116	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
5928	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
Token: SeDebugPrivilege	1700	oubr9.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4668 wrote to memory of 4180	4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe	89
PID 4668 wrote to memory of 4844	4668	b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe	91
PID 4180 wrote to memory of 5928	4180	cmd.exe	93
PID 4844 wrote to memory of 6116	4844	cmd.exe	94
PID 4844 wrote to memory of 5888	4844	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe
"C:\Users\Admin\AppData\Local\Temp\b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4668
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "oubr9" /tr '"C:\Users\Admin\AppData\Roaming\oubr9.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4180
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "oubr9" /tr '"C:\Users\Admin\AppData\Roaming\oubr9.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5928
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6095.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4844
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:6116
- - C:\Users\Admin\AppData\Roaming\oubr9.exe
    "C:\Users\Admin\AppData\Roaming\oubr9.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:5888

C:\Users\Admin\AppData\Roaming\oubr9.exe
"C:\Users\Admin\AppData\Roaming\oubr9.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1700

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

T1572

Exfiltration

Impact

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Downloads

tmp6095.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp6095.tmp.bat
Size 149B
SHA256 9b92826000d3a13549b804f9fefde707acedfcd38289e9fbcd0e50758043a70b
MD5 2c8daa788c799d259ce51dcdea32c002
SHA1 fa3d261d15c393d9fe04ef0a42b12e5b3f07fa57
SHA512 729713d2f95e780c18d31cbc008c7d2ef3523b3d32e981ba8d94a39303a141e10cde8bdb86fecd82ff4654176923fb661f5d2d3565665b0670309774f2a38c03
TLSH
T17FC08C5252C5EA0F280A145702BA958C91B26D2A3F84BB008704415A1280488E0A9241
MD5 SHA1 SHA512 TLSH

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oubr9.exe

Path C:\Users\Admin\AppData\Roaming\oubr9.exe
Size 45KB
SHA256 b1a5b16af75a497de1e1eb40557d5e9b3ec301b7759917e0daccdd6ff9b46cc9
MD5 30cfd0bb8fc44a20e7710d0c058a435d
SHA1 cc5268e0834d3cbbf28db51d9cc232ec3c411f67
SHA512 739f1766be5ae06778b5c5092bba7d19e28123f7f2910e0804fc044cf33d3df1839432cd67bc2a2d4a3295fdd1fac84821328700c23ee7888c733a7ab6a9ee5f
SSDEEP 768:cuqb5TrIGuCWUoKXMmo2qQ0fBohEaEPIQ2jbxgX3iM9Wxz4a7plUBDZUx:cuqb5TrhG2a4EapQ6b+XSMUxzf7bidUx
TLSH
T155232A003BE88127F2BE4F78A9F26145867AF6632603D58A1CC411DB5713FC6DA526FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1700-12-0x0000000074E30000-0x00000000755EC000-memory.dmp

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memory/1700-14-0x0000000074E30000-0x00000000755EC000-memory.dmp

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memory/4668-0-0x0000000074F52000-0x0000000074F53000-memory.dmp

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memory/4668-1-0x0000000000E00000-0x0000000000E12000-memory.dmp

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memory/4668-2-0x0000000074F40000-0x00000000756FC000-memory.dmp

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memory/4668-3-0x00000000059C0000-0x0000000005A5C000-memory.dmp

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memory/4668-8-0x0000000074F40000-0x00000000756FC000-memory.dmp

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