asyncrat | ef365c6e229664621c1d1bb560c247183843f75a1041ae9538bc93db685437c8

General

Target
sex-to-name-silo.exe
Size 48KB
Sample260604-jer6bsa16x
SHA256 ef365c6e229664621c1d1bb560c247183843f75a1041ae9538bc93db685437c8
MD5 db19d3403ac5dff61bb12e491f13052c
SHA1 0d177ba78c3fa7cd719374139cefcdd819b87d2b
SHA512 8b439392c3cf08ac04c49e2ec5a6bf1109c674f32ede34cda41d1bf28d6eb51c72c025c95c4ebd2525f38b3d10fef3f98ffc562667826cb6cdd7190458073caa
SSDEEP 1536:4ui4OTQriY2K0u6JPMNHoblbkha22dLHdhp:4ui7TQ2Y2K0u6tMNHoblbkdSnp
TLSH
T175231B003BEDC127F2BE5F74A9F2224546BAF6673603D54E1CC441971613FC69A42AFA
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

sextop1.cl:6606
sextop1.cl:7707
sextop1.cl:8808
sextop1.cl:443
sextop1.cl:80
sextop1.cl:8080
sextop1.cool:6606
sextop1.cool:7707
sextop1.cool:8808
sextop1.cool:443
sextop1.cool:80
sextop1.cool:8080
sextop1.net:6606
sextop1.net:7707
sextop1.net:8808
sextop1.net:443
sextop1.net:80
sextop1.net:8080
Sextop1.work:6606
Sextop1.work:7707
Sextop1.work:8808
Sextop1.work:443
Sextop1.work:80
Sextop1.work:8080
sextop1.blue:6606
sextop1.blue:7707
sextop1.blue:8808
sextop1.blue:443
sextop1.blue:80
sextop1.blue:8080
sextop1.moe:6606
sextop1.moe:7707
sextop1.moe:8808
sextop1.moe:443
sextop1.moe:80
sextop1.moe:8080
sextop1.sale:6606
sextop1.sale:7707
sextop1.sale:8808
sextop1.sale:443
sextop1.sale:80
sextop1.sale:8080
sextop1.ing:6606
sextop1.ing:7707
sextop1.ing:8808
sextop1.ing:443
sextop1.ing:80
sextop1.ing:8080
sextop1.cab:6606
sextop1.cab:7707
sextop1.cab:8808
sextop1.cab:443
sextop1.cab:80
sextop1.cab:8080
sextop1.moi:6606
sextop1.moi:7707
sextop1.moi:8808
sextop1.moi:443
sextop1.moi:80
sextop1.moi:8080
sextop1.bid:6606
sextop1.bid:7707
sextop1.bid:8808
sextop1.bid:443
sextop1.bid:80
sextop1.bid:8080
sextop1.dad:6606
sextop1.dad:7707
sextop1.dad:8808
sextop1.dad:443
sextop1.dad:80
sextop1.dad:8080
sextop1.skin:6606
sextop1.skin:7707
sextop1.skin:8808
sextop1.skin:443
sextop1.skin:80
sextop1.skin:8080
sextop1.dance:6606
sextop1.dance:7707
sextop1.dance:8808
sextop1.dance:443
sextop1.dance:80
sextop1.dance:8080

Mutex

aQRAwyqrqBjE

Attributes

delay
3
install
true
install_file
sex-to-name-silo.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/0x00060000000168d6-9.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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	sex-to-name-silo.exe

Executes dropped EXE 2 IoCs

pid	Process
652	sex-to-name-silo.exe
3648	sex-to-name-silo.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 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	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	sex-to-name-silo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sex-to-name-silo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sex-to-name-silo.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2332	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
1384	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe
3768	sex-to-name-silo.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3768	sex-to-name-silo.exe
Token: SeDebugPrivilege	652	sex-to-name-silo.exe
Token: SeDebugPrivilege	652	sex-to-name-silo.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3768 wrote to memory of 1128	3768	sex-to-name-silo.exe	93
PID 3768 wrote to memory of 5032	3768	sex-to-name-silo.exe	95
PID 5032 wrote to memory of 2332	5032	cmd.exe	97
PID 1128 wrote to memory of 1384	1128	cmd.exe	98
PID 5032 wrote to memory of 3648	5032	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\sex-to-name-silo.exe
"C:\Users\Admin\AppData\Local\Temp\sex-to-name-silo.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3768
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "sex-to-name-silo" /tr '"C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1128
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "sex-to-name-silo" /tr '"C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1384
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp60C8.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5032
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2332
- - C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe
    "C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3648

C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe
"C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:652

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

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

sex-to-name-silo.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\sex-to-name-silo.exe.log
Size 614B
SHA256 9ed5449a36700939987209c7a2974b9cc669b8b22c7c4e7936f35dda0a4dc359
MD5 54920f388010333559bdff225040761d
SHA1 040972bf1fc83014f10c45832322c094f883ce30
SHA512 e17aa5d1328b3bfd3754d15b3c2eded98653d90c7b326f941522e0b3bd6f557880246a6bc69047facb42eb97d2e0ed6c46148dfe95a98669fc4e1d07c21a285c
TLSH
T109F08B303722E1D88D522F521C2C7A9953EF078AB7A0DF2C7958536EDC26557AB211E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp60C8.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp60C8.tmp.bat
Size 160B
SHA256 5e205665aedca8065d05b67d19cd77d548145bcb7f0f4640703b1dbfe447c28c
MD5 b15f0a93784980933d92726d0aa4afdd
SHA1 00145e49eb0227c1a153993ee879400eea6c54b1
SHA512 b7435255a4ce7d5a1924c356318206f9e017185d8f1c52e6f1269cbd01f597e647c131d980e1607e22a7bd12568ead55a4a24ec231e2e98436a3d266da2d3808
TLSH
T135C08C4351C5EA1E280D285706FA998F92A2B8193F41BB10C304449E6780459E4D938D
MD5 SHA1 SHA512 TLSH

Submit Download

sex-to-name-silo.exe

Path C:\Users\Admin\AppData\Roaming\sex-to-name-silo.exe
Size 48KB
SHA256 ef365c6e229664621c1d1bb560c247183843f75a1041ae9538bc93db685437c8
MD5 db19d3403ac5dff61bb12e491f13052c
SHA1 0d177ba78c3fa7cd719374139cefcdd819b87d2b
SHA512 8b439392c3cf08ac04c49e2ec5a6bf1109c674f32ede34cda41d1bf28d6eb51c72c025c95c4ebd2525f38b3d10fef3f98ffc562667826cb6cdd7190458073caa
SSDEEP 1536:4ui4OTQriY2K0u6JPMNHoblbkha22dLHdhp:4ui7TQ2Y2K0u6tMNHoblbkdSnp
TLSH
T175231B003BEDC127F2BE5F74A9F2224546BAF6673603D54E1CC441971613FC69A42AFA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3768-0-0x00000000003C0000-0x00000000003D2000-memory.dmp

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memory/3768-1-0x0000000002760000-0x0000000002770000-memory.dmp

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memory/3768-2-0x0000000004D20000-0x0000000004D86000-memory.dmp

Download

memory/3768-3-0x00000000051B0000-0x000000000524C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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