asyncrat | 6a7acd0370583f01bff43b579ad0d45f29eedf6f004e70c4b0e793f7ea6c0448

General

Target

A4A7054AC8B42E6B6F60CF3CFB91916C.exe
Size

47KB
MD5

a4a7054ac8b42e6b6f60cf3cfb91916c
SHA1

4c32f6e0052bd83bae5a0516291972fc653262ce
SHA256

6a7acd0370583f01bff43b579ad0d45f29eedf6f004e70c4b0e793f7ea6c0448
SHA512

6603572c46f0074857746e80d0d2a761312f7ccc5f55df6e1401f902a061d0375d298d23aabbfb93e02e19c655399e4916c4fcd6cd5da4dba661d6334277d11e
SSDEEP

768:vu6XdTvER+SWUk6P4mo2qb1xr8/uq76XPITGRDi00XU4b2Nk2Bn4mq/WMPfE3WBH:vu6XdTv2S2UxQuq79TGRD0Tb2Nk2imda

Score

10^/10

asyncrat xworm default discovery execution persistence rat trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

103.174.191.71:6606

103.174.191.71:7707

103.174.191.71:8808

Mutex

HFE2t0VQV50q

Attributes

delay
3
install
false
install_file
game.exe
install_folder
%AppData%

aes.plain

Extracted

Family

xworm

Version

5.0

C2

103.174.191.71:15320

Mutex

o17wbGuWOIUfMnXn

Attributes

Install_directory
%Temp%
install_file
anti.exe

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0006000000016985-32.dat	family_xworm
behavioral2/memory/4188-36-0x0000000000B30000-0x0000000000B44000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	A4A7054AC8B42E6B6F60CF3CFB91916C.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\anti.lnk	ibsscu.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\anti.lnk	ibsscu.exe

Executes dropped EXE 1 IoCs

pid	Process
4188	ibsscu.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\anti = "C:\\Users\\Admin\\AppData\\Local\\Temp\\anti.exe"	ibsscu.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Start PowerShell.

execution

PowerShell

T1059.001

pid	Process
620	powershell.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 3 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	A4A7054AC8B42E6B6F60CF3CFB91916C.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
620	powershell.exe
620	powershell.exe
3180	A4A7054AC8B42E6B6F60CF3CFB91916C.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3180	A4A7054AC8B42E6B6F60CF3CFB91916C.exe
Token: SeDebugPrivilege	3180	A4A7054AC8B42E6B6F60CF3CFB91916C.exe
Token: SeDebugPrivilege	620	powershell.exe
Token: SeDebugPrivilege	4188	ibsscu.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3180 wrote to memory of 4988	3180	A4A7054AC8B42E6B6F60CF3CFB91916C.exe	87
PID 3180 wrote to memory of 4988	3180	A4A7054AC8B42E6B6F60CF3CFB91916C.exe	87
PID 3180 wrote to memory of 4988	3180	A4A7054AC8B42E6B6F60CF3CFB91916C.exe	87
PID 4988 wrote to memory of 620	4988	cmd.exe	89
PID 4988 wrote to memory of 620	4988	cmd.exe	89
PID 4988 wrote to memory of 620	4988	cmd.exe	89
PID 620 wrote to memory of 4188	620	powershell.exe	90
PID 620 wrote to memory of 4188	620	powershell.exe	90

C:\Users\Admin\AppData\Local\Temp\A4A7054AC8B42E6B6F60CF3CFB91916C.exe
"C:\Users\Admin\AppData\Local\Temp\A4A7054AC8B42E6B6F60CF3CFB91916C.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3180
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\ibsscu.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4988
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\ibsscu.exe"'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:620
  - - C:\Users\Admin\AppData\Local\Temp\ibsscu.exe
      "C:\Users\Admin\AppData\Local\Temp\ibsscu.exe"
      4⤵
      Drops startup file
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of AdjustPrivilegeToken
      PID:4188

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_w45hi1vi.aur.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\ibsscu.exe

Filesize
49KB

MD5
cd86c2933636bea72d49595aeb34c33a

SHA1
5919319fb99ab578df62059cbe78a52174bab1c6

SHA256
489d1b618cf7c3d24ff0926bc53738a1496bede40806d42acac75f95fc949e71

SHA512
4944df3e13d1f7b10b2a6dcf538121e4b4a5108a0f3ae60687db35baba97029f817691487658b49e333becb6d77e07e635c978f4971b138872a3487f06dcc7a0

Download Submit
memory/620-27-0x0000000006790000-0x00000000067AE000-memory.dmp

Filesize
120KB

Download
memory/620-31-0x0000000006CF0000-0x0000000006D12000-memory.dmp

Filesize
136KB

Download
memory/620-20-0x0000000006050000-0x0000000006072000-memory.dmp

Filesize
136KB

Download
memory/620-37-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/620-30-0x0000000006C70000-0x0000000006C8A000-memory.dmp

Filesize
104KB

Download
memory/620-29-0x0000000007970000-0x0000000007A06000-memory.dmp

Filesize
600KB

Download
memory/620-28-0x00000000067E0000-0x000000000682C000-memory.dmp

Filesize
304KB

Download
memory/620-25-0x00000000061F0000-0x0000000006256000-memory.dmp

Filesize
408KB

Download
memory/620-10-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/620-12-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/620-13-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/620-14-0x0000000005890000-0x0000000005EB8000-memory.dmp

Filesize
6.2MB

Download
memory/620-26-0x00000000063C0000-0x0000000006714000-memory.dmp

Filesize
3.3MB

Download
memory/620-11-0x0000000002EC0000-0x0000000002EF6000-memory.dmp

Filesize
216KB

Download
memory/3180-6-0x0000000006450000-0x00000000064C6000-memory.dmp

Filesize
472KB

Download
memory/3180-4-0x0000000005190000-0x000000000522C000-memory.dmp

Filesize
624KB

Download
memory/3180-0-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/3180-8-0x00000000063F0000-0x000000000640E000-memory.dmp

Filesize
120KB

Download
memory/3180-7-0x0000000005BF0000-0x0000000005BFC000-memory.dmp

Filesize
48KB

Download
memory/3180-3-0x0000000004CC0000-0x0000000004D26000-memory.dmp

Filesize
408KB

Download
memory/3180-2-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/3180-1-0x0000000000320000-0x0000000000332000-memory.dmp

Filesize
72KB

Download
memory/3180-5-0x0000000005C20000-0x00000000061C4000-memory.dmp

Filesize
5.6MB

Download
memory/3180-38-0x00007FF8B04F0000-0x00007FF8B06E5000-memory.dmp

Filesize
2.0MB

Download
memory/4188-36-0x0000000000B30000-0x0000000000B44000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads