asyncrat | b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce

General

Target
b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
Size 45KB
Sample260919-psnb7afd88
SHA256 b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce
MD5 3956887d00cdf4f738912f436f2d5c36
SHA1 3b3d260f2b46cc77e5f11f58cf1cc85f55e95464
SHA512 dc26f4a97d03be396cf44f655e4d5b2f44e87d7ca425066c47e8407b9d17bafffc6942b4cae1c64831144971622ef233e1ee2252c7c003f07d874ccafcb58f7d
SSDEEP 768:wuZ8pT1Uu4/cWUeT66mo2q1110CnMQRPn98PIQujbJgX3i7viOUofKElsXioRBDo:wuZ8pT1tc2MtnbvBQCbGXS7u3vdMx
TLSH
T177232B003BE9812BF2BF4F7459F26145867BF2636603D54A1C8441DB5B23FC69A42AFE
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

xemphimheo.org:80
xemphimheo.org:22
xemphimheo.org:8080
xemphimheo.org:8880
xemphimheo.org:2052
xemphimheo.org:2082
xemphimheo.org:2086
xemphimheo.org:2095
xemphimheo.org:443
xemphimheo.org:2053
xemphimheo.org:2083
xemphimheo.org:2087
xemphimheo.org:2096
xemphimheo.org:8443
www.xemphimheo.org:80
www.xemphimheo.org:22
www.xemphimheo.org:8080
www.xemphimheo.org:8880
www.xemphimheo.org:2052
www.xemphimheo.org:2082
www.xemphimheo.org:2086
www.xemphimheo.org:2095
www.xemphimheo.org:443
www.xemphimheo.org:2053
www.xemphimheo.org:2083
www.xemphimheo.org:2087
www.xemphimheo.org:2096
www.xemphimheo.org:8443
trisis.xemphimheo.org:80
trisis.xemphimheo.org:22
trisis.xemphimheo.org:8080
trisis.xemphimheo.org:8880
trisis.xemphimheo.org:2052
trisis.xemphimheo.org:2082
trisis.xemphimheo.org:2086
trisis.xemphimheo.org:2095
trisis.xemphimheo.org:443
trisis.xemphimheo.org:2053
trisis.xemphimheo.org:2083
trisis.xemphimheo.org:2087
trisis.xemphimheo.org:2096
trisis.xemphimheo.org:8443
locky.xemphimheo.org:80
locky.xemphimheo.org:22
locky.xemphimheo.org:8080
locky.xemphimheo.org:8880
locky.xemphimheo.org:2052
locky.xemphimheo.org:2082
locky.xemphimheo.org:2086
locky.xemphimheo.org:2095
locky.xemphimheo.org:443
locky.xemphimheo.org:2053
locky.xemphimheo.org:2083
locky.xemphimheo.org:2087
locky.xemphimheo.org:2096
locky.xemphimheo.org:8443

Mutex

RFyBAzLINiZY

Attributes

delay
0
install
true
install_file
oyod.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/0x000c0000000242d3-8.dat	family_asyncrat
behavioral1/memory/2964-10-0x0000000004CD0000-0x0000000004CE0000-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-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe

Executes dropped EXE 2 IoCs

pid	Process
2964	oyod.exe
4768	oyod.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	18	5.61.208.88:22	2964	oyod.exe
SSH destination	87	5.61.208.88:22	2964	oyod.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
4760	cmd.exe
1576	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	oyod.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	oyod.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1680	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
2060	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
Token: SeDebugPrivilege	2964	oyod.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1944 wrote to memory of 4760	1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe	89
PID 1944 wrote to memory of 1576	1944	b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe	91
PID 1576 wrote to memory of 1680	1576	cmd.exe	93
PID 4760 wrote to memory of 2060	4760	cmd.exe	94
PID 1576 wrote to memory of 4768	1576	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe
"C:\Users\Admin\AppData\Local\Temp\b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1944
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "oyod" /tr '"C:\Users\Admin\AppData\Roaming\oyod.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4760
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "oyod" /tr '"C:\Users\Admin\AppData\Roaming\oyod.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2060
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE961.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1576
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1680
- - C:\Users\Admin\AppData\Roaming\oyod.exe
    "C:\Users\Admin\AppData\Roaming\oyod.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4768

C:\Users\Admin\AppData\Roaming\oyod.exe
"C:\Users\Admin\AppData\Roaming\oyod.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2964

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

tmpE961.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpE961.tmp.bat
Size 148B
SHA256 76d04532e4106d337b7bf50e36c97417d2268971c6ecdb5266006eda815d8c75
MD5 80ef4f9dd0d6baf2c3c1aef9592cf97f
SHA1 7ae009a557d0d4c516404bbf96f281cbc295152b
SHA512 ec9da724444693c3a13f594ec81ed6f7196825349584bd016d2f557b2d06ee35f2aeee42e9a2733ab76a1ba7a22d5ad41782817bff5103981d3179f2b1b2778e
TLSH
T105C02B4392C6EA0E3806186302FFD4CCA1726C193F44FB80DB04800D22C0449F0DA342
MD5 SHA1 SHA512 TLSH

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oyod.exe

Path C:\Users\Admin\AppData\Roaming\oyod.exe
Size 45KB
SHA256 b2ec386ce8cf0a9bd3502bdd0a39af40d13c198cb51c5b22aa742e5a8f04cdce
MD5 3956887d00cdf4f738912f436f2d5c36
SHA1 3b3d260f2b46cc77e5f11f58cf1cc85f55e95464
SHA512 dc26f4a97d03be396cf44f655e4d5b2f44e87d7ca425066c47e8407b9d17bafffc6942b4cae1c64831144971622ef233e1ee2252c7c003f07d874ccafcb58f7d
SSDEEP 768:wuZ8pT1Uu4/cWUeT66mo2q1110CnMQRPn98PIQujbJgX3i7viOUofKElsXioRBDo:wuZ8pT1tc2MtnbvBQCbGXS7u3vdMx
TLSH
T177232B003BE9812BF2BF4F7459F26145867BF2636603D54A1C8441DB5B23FC69A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1944-0-0x00000000000D0000-0x00000000000E2000-memory.dmp

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memory/1944-1-0x0000000004B10000-0x0000000004B20000-memory.dmp

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memory/1944-2-0x00000000049C0000-0x0000000004A5C000-memory.dmp

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memory/2964-10-0x0000000004CD0000-0x0000000004CE0000-memory.dmp

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memory/2964-13-0x0000000004CD0000-0x0000000004CE0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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