asyncrat | b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5

General

Target
b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
Size 45KB
Sample260801-webjssee26
SHA256 b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5
MD5 9212c9d85df0e21a54bb7c1e6474db0a
SHA1 518b3c1139c54bb42c38028277c8c4218d5a7bb6
SHA512 a0ead650b4536eca2fbca82c5df885bc56a2ee3243672d7d80bcea7f69873f57d7b6fa885eb8ab47ac205d31e6ddbc14cb64ab1fa68ee047bf2d3b9818707921
SSDEEP 768:5uSy6pTpwrSWWUE3/WImo2qNvozfy3CKPI0VjbKgX3ifpwKcIrsWOu/pBDZ0x:5uSy6pTpoo2xTR09bdXSmKcIrs7md0x
TLSH
T104232B0037E9822BF2BE5F789DF26145867AF5633603D6891CC4119B5723FC68A426FE
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

xemsexmy.org:80
xemsexmy.org:22
xemsexmy.org:8080
xemsexmy.org:8880
xemsexmy.org:2052
xemsexmy.org:2082
xemsexmy.org:2086
xemsexmy.org:2095
xemsexmy.org:443
xemsexmy.org:2053
xemsexmy.org:2083
xemsexmy.org:2087
xemsexmy.org:2096
xemsexmy.org:8443
www.xemsexmy.org:80
www.xemsexmy.org:22
www.xemsexmy.org:8080
www.xemsexmy.org:8880
www.xemsexmy.org:2052
www.xemsexmy.org:2082
www.xemsexmy.org:2086
www.xemsexmy.org:2095
www.xemsexmy.org:443
www.xemsexmy.org:2053
www.xemsexmy.org:2083
www.xemsexmy.org:2087
www.xemsexmy.org:2096
www.xemsexmy.org:8443
conficker.xemsexmy.org:80
conficker.xemsexmy.org:22
conficker.xemsexmy.org:8080
conficker.xemsexmy.org:8880
conficker.xemsexmy.org:2052
conficker.xemsexmy.org:2082
conficker.xemsexmy.org:2086
conficker.xemsexmy.org:2095
conficker.xemsexmy.org:443
conficker.xemsexmy.org:2053
conficker.xemsexmy.org:2083
conficker.xemsexmy.org:2087
conficker.xemsexmy.org:2096
conficker.xemsexmy.org:8443
hacker.xemsexmy.org:80
hacker.xemsexmy.org:22
hacker.xemsexmy.org:8080
hacker.xemsexmy.org:8880
hacker.xemsexmy.org:2052
hacker.xemsexmy.org:2082
hacker.xemsexmy.org:2086
hacker.xemsexmy.org:2095
hacker.xemsexmy.org:443
hacker.xemsexmy.org:2053
hacker.xemsexmy.org:2083
hacker.xemsexmy.org:2087
hacker.xemsexmy.org:2096
hacker.xemsexmy.org:8443

Mutex

I74vqBemXOgo

Attributes

delay
0
install
true
install_file
zsotr5c.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/0x000800000002447f-8.dat	family_asyncrat
behavioral1/memory/436-13-0x0000000005100000-0x0000000005110000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe

Executes dropped EXE 2 IoCs

pid	Process
436	zsotr5c.exe
1900	zsotr5c.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	17	104.21.32.163:22	436	zsotr5c.exe
SSH destination	34	172.67.152.224:22	436	zsotr5c.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
4248	cmd.exe
3012	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	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zsotr5c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zsotr5c.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2148	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
4536	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
Token: SeDebugPrivilege	436	zsotr5c.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3576 wrote to memory of 4248	3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe	87
PID 3576 wrote to memory of 3012	3576	b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe	89
PID 3012 wrote to memory of 2148	3012	cmd.exe	91
PID 4248 wrote to memory of 4536	4248	cmd.exe	92
PID 3012 wrote to memory of 1900	3012	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe
"C:\Users\Admin\AppData\Local\Temp\b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3576
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "zsotr5c" /tr '"C:\Users\Admin\AppData\Roaming\zsotr5c.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4248
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "zsotr5c" /tr '"C:\Users\Admin\AppData\Roaming\zsotr5c.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4536
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC0CA.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3012
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2148
- - C:\Users\Admin\AppData\Roaming\zsotr5c.exe
    "C:\Users\Admin\AppData\Roaming\zsotr5c.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1900

C:\Users\Admin\AppData\Roaming\zsotr5c.exe
"C:\Users\Admin\AppData\Roaming\zsotr5c.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:436

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

tmpC0CA.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpC0CA.tmp.bat
Size 151B
SHA256 5b1751fba3f92d6d2a6d14ded2ab39446837d3ea4ab07ad555b0ae738e23840a
MD5 4209dda2abf6548856a9af309027b831
SHA1 92dfbc2011832834ded59c0801d2f6ee98dcb294
SHA512 307275de951741f1f8f536736020e3170b3bb922d0d365bd3a4b5f6cc72373e0466e05c07678e18253fd46ea9be5d2ae9993197ac84a7a6263ba9ad090d65e65
TLSH
T176C02BC295C6EB5E680D142302FBD88D93F66C593F44BB40C304404D2A80449F0E9341
MD5 SHA1 SHA512 TLSH

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zsotr5c.exe

Path C:\Users\Admin\AppData\Roaming\zsotr5c.exe
Size 45KB
SHA256 b505b4f7d50138d6933cd2860ad61c379c429d072ee72a0670a865ac1bef8cc5
MD5 9212c9d85df0e21a54bb7c1e6474db0a
SHA1 518b3c1139c54bb42c38028277c8c4218d5a7bb6
SHA512 a0ead650b4536eca2fbca82c5df885bc56a2ee3243672d7d80bcea7f69873f57d7b6fa885eb8ab47ac205d31e6ddbc14cb64ab1fa68ee047bf2d3b9818707921
SSDEEP 768:5uSy6pTpwrSWWUE3/WImo2qNvozfy3CKPI0VjbKgX3ifpwKcIrsWOu/pBDZ0x:5uSy6pTpoo2xTR09bdXSmKcIrs7md0x
TLSH
T104232B0037E9822BF2BE5F789DF26145867AF5633603D6891CC4119B5723FC68A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/436-10-0x0000000005100000-0x0000000005110000-memory.dmp

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memory/436-13-0x0000000005100000-0x0000000005110000-memory.dmp

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memory/3576-0-0x0000000000BD0000-0x0000000000BE2000-memory.dmp

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memory/3576-1-0x0000000005680000-0x0000000005690000-memory.dmp

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memory/3576-2-0x0000000005590000-0x000000000562C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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