asyncrat | 531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56

General

Target
531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
Size 45KB
Sample260804-1rt9wshd74
SHA256 531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56
MD5 a5073187e4cbba6724ca47e5be1a2cae
SHA1 54e6b4bcb13c4a9f1dfd82e48e1683ad30169db2
SHA512 f6360efe7369bb30a6c968579956635e3699ba7d8af3d2ba18b9565e7c23613b3ea2afefec02c4a75d0b7c1aab5e6fea419a4bc297fbb7335e5b16b0d34dc155
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9EELO9YjMHPICUzjbhgX3ipj9jR2nd3dFxu/hUUBD4:0u1YJTHcw2F6wgCU3bOXSpj9jcnd3dFt
TLSH
T13F231B003BE9C23BF2BE4F78A9F26145867AF6632603D54D1CC451DB5623FC68A426ED
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

phimsexvnn.com:80
phimsexvnn.com:22
phimsexvnn.com:8080
phimsexvnn.com:8880
phimsexvnn.com:2052
phimsexvnn.com:2082
phimsexvnn.com:2086
phimsexvnn.com:2095
phimsexvnn.com:443
phimsexvnn.com:2053
phimsexvnn.com:2083
phimsexvnn.com:2087
phimsexvnn.com:2096
phimsexvnn.com:8443
www.phimsexvnn.com:80
www.phimsexvnn.com:22
www.phimsexvnn.com:8080
www.phimsexvnn.com:8880
www.phimsexvnn.com:2052
www.phimsexvnn.com:2082
www.phimsexvnn.com:2086
www.phimsexvnn.com:2095
www.phimsexvnn.com:443
www.phimsexvnn.com:2053
www.phimsexvnn.com:2083
www.phimsexvnn.com:2087
www.phimsexvnn.com:2096
www.phimsexvnn.com:8443
trisis.phimsexvnn.com:80
trisis.phimsexvnn.com:22
trisis.phimsexvnn.com:8080
trisis.phimsexvnn.com:8880
trisis.phimsexvnn.com:2052
trisis.phimsexvnn.com:2082
trisis.phimsexvnn.com:2086
trisis.phimsexvnn.com:2095
trisis.phimsexvnn.com:443
trisis.phimsexvnn.com:2053
trisis.phimsexvnn.com:2083
trisis.phimsexvnn.com:2087
trisis.phimsexvnn.com:2096
trisis.phimsexvnn.com:8443
blacklotus.phimsexvnn.com:80
blacklotus.phimsexvnn.com:22
blacklotus.phimsexvnn.com:8080
blacklotus.phimsexvnn.com:8880
blacklotus.phimsexvnn.com:2052
blacklotus.phimsexvnn.com:2082
blacklotus.phimsexvnn.com:2086
blacklotus.phimsexvnn.com:2095
blacklotus.phimsexvnn.com:443
blacklotus.phimsexvnn.com:2053
blacklotus.phimsexvnn.com:2083
blacklotus.phimsexvnn.com:2087
blacklotus.phimsexvnn.com:2096
blacklotus.phimsexvnn.com:8443

Mutex

RPXPypY7J0Lp

Attributes

delay
0
install
true
install_file
l066ty.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/0x000a000000024384-8.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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe

Executes dropped EXE 2 IoCs

pid	Process
3296	l066ty.exe
1388	l066ty.exe

Outbound SSH connection to public host 2 TTPs 4 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	98	172.67.132.249:22	3296	l066ty.exe
SSH destination	11	104.21.5.48:22	3296	l066ty.exe
SSH destination	17	172.67.132.249:22	3296	l066ty.exe
SSH destination	59	104.21.5.48:22	3296	l066ty.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
2120	cmd.exe
856	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	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.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	l066ty.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	l066ty.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4708	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
1188	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
Token: SeDebugPrivilege	3296	l066ty.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3664 wrote to memory of 2120	3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe	85
PID 3664 wrote to memory of 856	3664	531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe	87
PID 856 wrote to memory of 4708	856	cmd.exe	89
PID 2120 wrote to memory of 1188	2120	cmd.exe	90
PID 856 wrote to memory of 1388	856	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe
"C:\Users\Admin\AppData\Local\Temp\531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3664
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "l066ty" /tr '"C:\Users\Admin\AppData\Roaming\l066ty.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2120
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "l066ty" /tr '"C:\Users\Admin\AppData\Roaming\l066ty.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1188
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp12F6.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:856
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4708
- - C:\Users\Admin\AppData\Roaming\l066ty.exe
    "C:\Users\Admin\AppData\Roaming\l066ty.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1388

C:\Users\Admin\AppData\Roaming\l066ty.exe
"C:\Users\Admin\AppData\Roaming\l066ty.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3296

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

tmp12F6.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp12F6.tmp.bat
Size 150B
SHA256 338c1ef1fb892ba454f43305e5203af688213edfeaea1a01de20d3a29b1cbec2
MD5 c8f9b5441d8d3138a6aecbcc3105ddac
SHA1 0fdd8c38fc4856dac87f2480d0c3ec1455807c56
SHA512 b869feaa566c8aa4c1c69306f7cad9e891b684439adad4dc262fbc07c8f5c52953c7fcd19cbdb320b48b1fbdc8c3a91ed1b41b7a821f0756550e98c5eb2998bb
TLSH
T1A1C02B8292CAEA0E390D242302FAD4CDB1766C2A3F84FB40C304401D1280C5CF4DD381
MD5 SHA1 SHA512 TLSH

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l066ty.exe

Path C:\Users\Admin\AppData\Roaming\l066ty.exe
Size 45KB
SHA256 531e78b354c4c3bc34c6756cb7fa4455c4cca99f05ebc87cb24e42c071777f56
MD5 a5073187e4cbba6724ca47e5be1a2cae
SHA1 54e6b4bcb13c4a9f1dfd82e48e1683ad30169db2
SHA512 f6360efe7369bb30a6c968579956635e3699ba7d8af3d2ba18b9565e7c23613b3ea2afefec02c4a75d0b7c1aab5e6fea419a4bc297fbb7335e5b16b0d34dc155
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9EELO9YjMHPICUzjbhgX3ipj9jR2nd3dFxu/hUUBD4:0u1YJTHcw2F6wgCU3bOXSpj9jcnd3dFt
TLSH
T13F231B003BE9C23BF2BE4F78A9F26145867AF6632603D54D1CC451DB5623FC68A426ED
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/3296-10-0x0000000005210000-0x0000000005220000-memory.dmp

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memory/3296-13-0x0000000005210000-0x0000000005220000-memory.dmp

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memory/3664-0-0x0000000000240000-0x0000000000252000-memory.dmp

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memory/3664-1-0x0000000004AC0000-0x0000000004AD0000-memory.dmp

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memory/3664-2-0x0000000004B70000-0x0000000004C0C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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