asyncrat | a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae

General

Target
a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
Size 45KB
Sample260703-lvdc8aex9v
SHA256 a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae
MD5 6ab3ba24bedd6222b505f0b2891a42db
SHA1 951ffa9181e1b973605e597d7a8668ebc5c2c6e0
SHA512 ef636e731e557b317f6e8168d9b7bd2c4c3a7b13bf361c7fc19f74b15061f100760b828d11b52cbae921ac52182d8ecdbfc87b82d2ec03c5e1a0c8a81d31575b
SSDEEP 768:cu7m/5THrq+CWUoDuMmo2qFN3HO4SNMOPI0azjbqgB3i3z5gZCVtdJnEBDZUx:cu7e5TH2A2U+JM30a3b9BSjgC/mdUx
TLSH
T1FC231A003BE8812BF2BE4F789CF26145467AF6732603D94A1CC4529B5613FC6DA526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

cuongsex.com:80
cuongsex.com:22
cuongsex.com:8080
cuongsex.com:8880
cuongsex.com:2052
cuongsex.com:2082
cuongsex.com:2086
cuongsex.com:2095
cuongsex.com:443
cuongsex.com:2053
cuongsex.com:2083
cuongsex.com:2087
cuongsex.com:2096
cuongsex.com:8443
www.cuongsex.com:80
www.cuongsex.com:22
www.cuongsex.com:8080
www.cuongsex.com:8880
www.cuongsex.com:2052
www.cuongsex.com:2082
www.cuongsex.com:2086
www.cuongsex.com:2095
www.cuongsex.com:443
www.cuongsex.com:2053
www.cuongsex.com:2083
www.cuongsex.com:2087
www.cuongsex.com:2096
www.cuongsex.com:8443
wannacry.cuongsex.com:80
wannacry.cuongsex.com:22
wannacry.cuongsex.com:8080
wannacry.cuongsex.com:8880
wannacry.cuongsex.com:2052
wannacry.cuongsex.com:2082
wannacry.cuongsex.com:2086
wannacry.cuongsex.com:2095
wannacry.cuongsex.com:443
wannacry.cuongsex.com:2053
wannacry.cuongsex.com:2083
wannacry.cuongsex.com:2087
wannacry.cuongsex.com:2096
wannacry.cuongsex.com:8443
malware.cuongsex.com:80
malware.cuongsex.com:22
malware.cuongsex.com:8080
malware.cuongsex.com:8880
malware.cuongsex.com:2052
malware.cuongsex.com:2082
malware.cuongsex.com:2086
malware.cuongsex.com:2095
malware.cuongsex.com:443
malware.cuongsex.com:2053
malware.cuongsex.com:2083
malware.cuongsex.com:2087
malware.cuongsex.com:2096
malware.cuongsex.com:8443
zbot.cuongsex.com:80
zbot.cuongsex.com:22
zbot.cuongsex.com:8080
zbot.cuongsex.com:8880
zbot.cuongsex.com:2052
zbot.cuongsex.com:2082
zbot.cuongsex.com:2086
zbot.cuongsex.com:2095
zbot.cuongsex.com:443
zbot.cuongsex.com:2053
zbot.cuongsex.com:2083
zbot.cuongsex.com:2087
zbot.cuongsex.com:2096
zbot.cuongsex.com:8443

Mutex

RMNHfsYKvRTU

Attributes

delay
0
install
true
install_file
4ix5n.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/0x000300000001e6a4-8.dat	family_asyncrat
behavioral1/memory/5036-10-0x0000000004DD0000-0x0000000004DE0000-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	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe

Executes dropped EXE 2 IoCs

pid	Process
5036	4ix5n.exe
3872	4ix5n.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.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	4ix5n.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4ix5n.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2000	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
3256	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
Token: SeDebugPrivilege	5036	4ix5n.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1832 wrote to memory of 4392	1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe	87
PID 1832 wrote to memory of 1040	1832	a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe	89
PID 1040 wrote to memory of 2000	1040	cmd.exe	91
PID 4392 wrote to memory of 3256	4392	cmd.exe	92
PID 1040 wrote to memory of 3872	1040	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe
"C:\Users\Admin\AppData\Local\Temp\a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1832
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "4ix5n" /tr '"C:\Users\Admin\AppData\Roaming\4ix5n.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4392
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "4ix5n" /tr '"C:\Users\Admin\AppData\Roaming\4ix5n.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3256
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4801.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1040
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2000
- - C:\Users\Admin\AppData\Roaming\4ix5n.exe
    "C:\Users\Admin\AppData\Roaming\4ix5n.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3872

C:\Users\Admin\AppData\Roaming\4ix5n.exe
"C:\Users\Admin\AppData\Roaming\4ix5n.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5036

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp4801.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4801.tmp.bat
Size 149B
SHA256 433f94d238ee3050586bb1dabcd33429f6335b0f8a3f372b5da449fe3cd06bb0
MD5 e0fb57a45c3faffc2eb9477e73bca8db
SHA1 39f667d8398a88e30f7298e83415e2a90b80db2d
SHA512 db9b6d2b2e1785061b4cc665af5eb54dfa846b211430d20edc54ff20f9db22559b0944b38dd661177d589e39706eed2f008804a9291c4b6c89a0a0a64132969e
TLSH
T145C02B4292C5EA4F2805245306FAD48CD172AC593F40BB40C30484DD52C0459F0D9342
MD5 SHA1 SHA512 TLSH

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4ix5n.exe

Path C:\Users\Admin\AppData\Roaming\4ix5n.exe
Size 45KB
SHA256 a1af0fdc9e841ddcf88d7efbb0d2b4f61593668909308bfc9f5e2440f49fa0ae
MD5 6ab3ba24bedd6222b505f0b2891a42db
SHA1 951ffa9181e1b973605e597d7a8668ebc5c2c6e0
SHA512 ef636e731e557b317f6e8168d9b7bd2c4c3a7b13bf361c7fc19f74b15061f100760b828d11b52cbae921ac52182d8ecdbfc87b82d2ec03c5e1a0c8a81d31575b
SSDEEP 768:cu7m/5THrq+CWUoDuMmo2qFN3HO4SNMOPI0azjbqgB3i3z5gZCVtdJnEBDZUx:cu7e5TH2A2U+JM30a3b9BSjgC/mdUx
TLSH
T1FC231A003BE8812BF2BE4F789CF26145467AF6732603D94A1CC4529B5613FC6DA526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1832-0-0x00000000004A0000-0x00000000004B2000-memory.dmp

Download

memory/1832-1-0x0000000004FB0000-0x0000000004FC0000-memory.dmp

Download

memory/1832-2-0x0000000004E90000-0x0000000004F2C000-memory.dmp

Download

memory/5036-10-0x0000000004DD0000-0x0000000004DE0000-memory.dmp

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memory/5036-13-0x0000000004DD0000-0x0000000004DE0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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