asyncrat | 1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada

General

Target
1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
Size 45KB
Sample260804-k2swtabp5w
SHA256 1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada
MD5 8a5549ae4e9ae1633dede40883e81c97
SHA1 e9572d96eacddcad07de7e8ddbb8b627fbf3664c
SHA512 60ccc266c2b68ddf38abb924146339d4cc4ead7d9cac4e07a02fa52efd942413a96889dc990e8d20c547659c8675c22a731f2cf238bffaa1082ef8c90211ffcb
SSDEEP 768:EufspTfzcR6uWUcb+wmo2q9L9YSkq/zNOPIFzjbKgR3i6Slgey1hFPZYBDZsx:EufspTf2g2maVC3F3bdRS6SlgeyHZZec
TLSH
T183231A003BE9C12BF2BE4F78A9F26105827EE6673603D64A1CC451DB5713BC686526FE
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

maymaykienlong.com:80
maymaykienlong.com:22
maymaykienlong.com:8080
maymaykienlong.com:8880
maymaykienlong.com:2052
maymaykienlong.com:2082
maymaykienlong.com:2086
maymaykienlong.com:2095
maymaykienlong.com:443
maymaykienlong.com:2053
maymaykienlong.com:2083
maymaykienlong.com:2087
maymaykienlong.com:2096
maymaykienlong.com:8443
www.maymaykienlong.com:80
www.maymaykienlong.com:22
www.maymaykienlong.com:8080
www.maymaykienlong.com:8880
www.maymaykienlong.com:2052
www.maymaykienlong.com:2082
www.maymaykienlong.com:2086
www.maymaykienlong.com:2095
www.maymaykienlong.com:443
www.maymaykienlong.com:2053
www.maymaykienlong.com:2083
www.maymaykienlong.com:2087
www.maymaykienlong.com:2096
www.maymaykienlong.com:8443
cl0p.maymaykienlong.com:80
cl0p.maymaykienlong.com:22
cl0p.maymaykienlong.com:8080
cl0p.maymaykienlong.com:8880
cl0p.maymaykienlong.com:2052
cl0p.maymaykienlong.com:2082
cl0p.maymaykienlong.com:2086
cl0p.maymaykienlong.com:2095
cl0p.maymaykienlong.com:443
cl0p.maymaykienlong.com:2053
cl0p.maymaykienlong.com:2083
cl0p.maymaykienlong.com:2087
cl0p.maymaykienlong.com:2096
cl0p.maymaykienlong.com:8443
hermeticwiper.maymaykienlong.com:80
hermeticwiper.maymaykienlong.com:22
hermeticwiper.maymaykienlong.com:8080
hermeticwiper.maymaykienlong.com:8880
hermeticwiper.maymaykienlong.com:2052
hermeticwiper.maymaykienlong.com:2082
hermeticwiper.maymaykienlong.com:2086
hermeticwiper.maymaykienlong.com:2095
hermeticwiper.maymaykienlong.com:443
hermeticwiper.maymaykienlong.com:2053
hermeticwiper.maymaykienlong.com:2083
hermeticwiper.maymaykienlong.com:2087
hermeticwiper.maymaykienlong.com:2096
hermeticwiper.maymaykienlong.com:8443

Mutex

TtF2gNpugds5

Attributes

delay
0
install
true
install_file
thoml8j.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/0x000800000002435e-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe

Executes dropped EXE 2 IoCs

pid	Process
1432	thoml8j.exe
4108	thoml8j.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	13	104.21.84.115:22	1432	thoml8j.exe
SSH destination	20	172.67.191.146:22	1432	thoml8j.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
4972	cmd.exe
1420	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	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.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	thoml8j.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	thoml8j.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4212	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
3508	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
Token: SeDebugPrivilege	1432	thoml8j.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4420 wrote to memory of 4972	4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe	86
PID 4420 wrote to memory of 1420	4420	1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe	88
PID 1420 wrote to memory of 4212	1420	cmd.exe	90
PID 4972 wrote to memory of 3508	4972	cmd.exe	91
PID 1420 wrote to memory of 4108	1420	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe
"C:\Users\Admin\AppData\Local\Temp\1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4420
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "thoml8j" /tr '"C:\Users\Admin\AppData\Roaming\thoml8j.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4972
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "thoml8j" /tr '"C:\Users\Admin\AppData\Roaming\thoml8j.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3508
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4188.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1420
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4212
- - C:\Users\Admin\AppData\Roaming\thoml8j.exe
    "C:\Users\Admin\AppData\Roaming\thoml8j.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4108

C:\Users\Admin\AppData\Roaming\thoml8j.exe
"C:\Users\Admin\AppData\Roaming\thoml8j.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1432

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

tmp4188.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4188.tmp.bat
Size 151B
SHA256 785b9eb52aebad4fa93cc8cfd5ee06da4cab8428a761ec8c1e76857cf68d73a0
MD5 50cdfbebf8e05a873f6b3f08bbaf560d
SHA1 5f278fc93c552ffa6bdb3905c9ea6207cd625417
SHA512 6fe23109b00dc53bd9f849be52c16edfe03164458371f4694c17ba6200b58c9267c9d757474025033b938d3f65a01bd0e48f91da1a43115faed2cce988d985cf
TLSH
T118C02BA251C6EA4E2909289706FBD48FA1B26C193F48BB60C704884E2380449F0EE3C1
MD5 SHA1 SHA512 TLSH

Submit Download

thoml8j.exe

Path C:\Users\Admin\AppData\Roaming\thoml8j.exe
Size 45KB
SHA256 1a111331191ca88decfc4413930b7638b6e007b9f654677416bf8066fecb8ada
MD5 8a5549ae4e9ae1633dede40883e81c97
SHA1 e9572d96eacddcad07de7e8ddbb8b627fbf3664c
SHA512 60ccc266c2b68ddf38abb924146339d4cc4ead7d9cac4e07a02fa52efd942413a96889dc990e8d20c547659c8675c22a731f2cf238bffaa1082ef8c90211ffcb
SSDEEP 768:EufspTfzcR6uWUcb+wmo2q9L9YSkq/zNOPIFzjbKgR3i6Slgey1hFPZYBDZsx:EufspTf2g2maVC3F3bdRS6SlgeyHZZec
TLSH
T183231A003BE9C12BF2BE4F78A9F26105827EE6673603D64A1CC451DB5713BC686526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1432-10-0x0000000005130000-0x0000000005140000-memory.dmp

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memory/1432-13-0x0000000005130000-0x0000000005140000-memory.dmp

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memory/4420-0-0x0000000000B10000-0x0000000000B22000-memory.dmp

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memory/4420-1-0x0000000005480000-0x0000000005490000-memory.dmp

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memory/4420-2-0x0000000005530000-0x00000000055CC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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