asyncrat | 55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9

General

Target
55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
Size 45KB
Sample260803-pp3byaxfqa
SHA256 55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9
MD5 95d64044c0936bccab7cd28c2115904e
SHA1 820091933612026096e4267f704a5b913d151da8
SHA512 f34ae5cbfd7a39796fc5bf37a15be50db3a9a6508fc5833707f2cc6370b948cba557fa90f7d3d4d0792943031aaf731e322c185512d92276aa82bec52cc27b32
SSDEEP 768:8uuSpTg7GBoWUSH6+mo2qYhoRQKIJOPIhzjbigz3i8gjgLfF3299APBDZ0x:8uuSpTgyf2JYxg3h3bFzS8QgR3Ssd0x
TLSH
T1CD233B0037E8C12BF2BE4F78A9F26145867AF6633602D54E1CC451DB5713FC69A426EE
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

haysexcdn.net:80
haysexcdn.net:22
haysexcdn.net:8080
haysexcdn.net:8880
haysexcdn.net:2052
haysexcdn.net:2082
haysexcdn.net:2086
haysexcdn.net:2095
haysexcdn.net:443
haysexcdn.net:2053
haysexcdn.net:2083
haysexcdn.net:2087
haysexcdn.net:2096
haysexcdn.net:8443
www.haysexcdn.net:80
www.haysexcdn.net:22
www.haysexcdn.net:8080
www.haysexcdn.net:8880
www.haysexcdn.net:2052
www.haysexcdn.net:2082
www.haysexcdn.net:2086
www.haysexcdn.net:2095
www.haysexcdn.net:443
www.haysexcdn.net:2053
www.haysexcdn.net:2083
www.haysexcdn.net:2087
www.haysexcdn.net:2096
www.haysexcdn.net:8443
stuxnet.haysexcdn.net:80
stuxnet.haysexcdn.net:22
stuxnet.haysexcdn.net:8080
stuxnet.haysexcdn.net:8880
stuxnet.haysexcdn.net:2052
stuxnet.haysexcdn.net:2082
stuxnet.haysexcdn.net:2086
stuxnet.haysexcdn.net:2095
stuxnet.haysexcdn.net:443
stuxnet.haysexcdn.net:2053
stuxnet.haysexcdn.net:2083
stuxnet.haysexcdn.net:2087
stuxnet.haysexcdn.net:2096
stuxnet.haysexcdn.net:8443
iloveyou.haysexcdn.net:80
iloveyou.haysexcdn.net:22
iloveyou.haysexcdn.net:8080
iloveyou.haysexcdn.net:8880
iloveyou.haysexcdn.net:2052
iloveyou.haysexcdn.net:2082
iloveyou.haysexcdn.net:2086
iloveyou.haysexcdn.net:2095
iloveyou.haysexcdn.net:443
iloveyou.haysexcdn.net:2053
iloveyou.haysexcdn.net:2083
iloveyou.haysexcdn.net:2087
iloveyou.haysexcdn.net:2096
iloveyou.haysexcdn.net:8443
conficker.haysexcdn.net:80
conficker.haysexcdn.net:22
conficker.haysexcdn.net:8080
conficker.haysexcdn.net:8880
conficker.haysexcdn.net:2052
conficker.haysexcdn.net:2082
conficker.haysexcdn.net:2086
conficker.haysexcdn.net:2095
conficker.haysexcdn.net:443
conficker.haysexcdn.net:2053
conficker.haysexcdn.net:2083
conficker.haysexcdn.net:2087
conficker.haysexcdn.net:2096
conficker.haysexcdn.net:8443
malware.haysexcdn.net:80
malware.haysexcdn.net:22
malware.haysexcdn.net:8080
malware.haysexcdn.net:8880
malware.haysexcdn.net:2052
malware.haysexcdn.net:2082
malware.haysexcdn.net:2086
malware.haysexcdn.net:2095
malware.haysexcdn.net:443
malware.haysexcdn.net:2053
malware.haysexcdn.net:2083
malware.haysexcdn.net:2087
malware.haysexcdn.net:2096
malware.haysexcdn.net:8443

Mutex

6lbgAjKx7qdb

Attributes

delay
0
install
true
install_file
5th0oh.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 3 IoCs

rat

resource	yara_rule
behavioral1/files/0x000300000001e699-8.dat	family_asyncrat
behavioral1/memory/2316-10-0x00000000053A0000-0x00000000053B0000-memory.dmp	family_asyncrat
behavioral1/memory/2316-13-0x00000000053A0000-0x00000000053B0000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe

Executes dropped EXE 2 IoCs

pid	Process
2316	5th0oh.exe
4732	5th0oh.exe

Outbound SSH connection to public host 2 TTPs 3 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	52	104.26.4.211:22	2316	5th0oh.exe
SSH destination	61	172.67.73.19:22	2316	5th0oh.exe
SSH destination	64	104.26.5.211:22	2316	5th0oh.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
3744	cmd.exe
2552	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	5th0oh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.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	5th0oh.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1168	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
1864	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
Token: SeDebugPrivilege	2316	5th0oh.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3224 wrote to memory of 2552	3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe	85
PID 3224 wrote to memory of 3744	3224	55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe	87
PID 3744 wrote to memory of 1168	3744	cmd.exe	89
PID 2552 wrote to memory of 1864	2552	cmd.exe	90
PID 3744 wrote to memory of 4732	3744	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe
"C:\Users\Admin\AppData\Local\Temp\55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3224
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "5th0oh" /tr '"C:\Users\Admin\AppData\Roaming\5th0oh.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2552
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "5th0oh" /tr '"C:\Users\Admin\AppData\Roaming\5th0oh.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1864
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp43EA.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3744
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1168
- - C:\Users\Admin\AppData\Roaming\5th0oh.exe
    "C:\Users\Admin\AppData\Roaming\5th0oh.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4732

C:\Users\Admin\AppData\Roaming\5th0oh.exe
"C:\Users\Admin\AppData\Roaming\5th0oh.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2316

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

tmp43EA.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp43EA.tmp.bat
Size 150B
SHA256 98625361210eec008d6e879dadf734bbd7aa7ab76099285f8fcd3413ca6b4f4a
MD5 d6c9cd2aa010ab87c3046d294ea9eef8
SHA1 aef802c2fb3f91b6e4f027c2f8a85b63d82a0c02
SHA512 5d355d979211bf0c44558f23d2114954165cdba5ae22f73b97f2403234fc7f43708864096ecd1017fc7d3270b80764a2f622b1eff58fbc75a0745961e81da548
TLSH
T159C08C4265C6AA0EA805341306BA948C9166AD193E80AB40C70880892680489E899241
MD5 SHA1 SHA512 TLSH

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5th0oh.exe

Path C:\Users\Admin\AppData\Roaming\5th0oh.exe
Size 45KB
SHA256 55b3f4b9abf68fd0534e4dee8e457a91ab8197d3bbd7ebf0cc3e73e01c4964b9
MD5 95d64044c0936bccab7cd28c2115904e
SHA1 820091933612026096e4267f704a5b913d151da8
SHA512 f34ae5cbfd7a39796fc5bf37a15be50db3a9a6508fc5833707f2cc6370b948cba557fa90f7d3d4d0792943031aaf731e322c185512d92276aa82bec52cc27b32
SSDEEP 768:8uuSpTg7GBoWUSH6+mo2qYhoRQKIJOPIhzjbigz3i8gjgLfF3299APBDZ0x:8uuSpTgyf2JYxg3h3bFzS8QgR3Ssd0x
TLSH
T1CD233B0037E8C12BF2BE4F78A9F26145867AF6633602D54E1CC451DB5713FC69A426EE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2316-10-0x00000000053A0000-0x00000000053B0000-memory.dmp

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memory/2316-13-0x00000000053A0000-0x00000000053B0000-memory.dmp

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memory/3224-0-0x0000000000ED0000-0x0000000000EE2000-memory.dmp

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memory/3224-1-0x0000000005960000-0x0000000005970000-memory.dmp

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memory/3224-2-0x0000000005880000-0x000000000591C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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