asyncrat | 8a9c3f8187497cdd1eb45c4718382a458934af2e08dd29547257d75cd12b924a

General

Target
upgrade.exe
Size 112KB
Sample261102-p3kn2sfb62
SHA256 8a9c3f8187497cdd1eb45c4718382a458934af2e08dd29547257d75cd12b924a
MD5 e810c2d1e991cf1016e3aab47d36da2d
SHA1 a16101328fde25bffe673e8a87fabaf64c152f40
SHA512 18288ed70a6935085b05d87b17059f692ab1878eb5bcf418cd3cf7c72d2a7528ac0e010d1f7e1f78bf1c82863b510dd36e0d7d37f090b823641db99d3782536e
SSDEEP 1536:7uTO9TgQCv2IK0efbDXShyia6E4d6tKrqi35Rwa3:7uTaTg7v2r0efbDl4pPwa3
TLSH
T11CB39F30EFD7B03AED6D4AFC5CA371714925A9D3250EF57AFCC0328716226C1A5326A9
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

fulhamdrycleaners.co.uk:443
fulhamdrycleaners.co.uk:80
fulhamdrycleaners.co.uk:22
fulhamdrycleaners.co.uk:3306
fulhamdrycleaners.co.uk:21
fulhamdrycleaners.co.uk:5900
api.fulhamdrycleaners.co.uk:443
api.fulhamdrycleaners.co.uk:80
api.fulhamdrycleaners.co.uk:22
api.fulhamdrycleaners.co.uk:3306
api.fulhamdrycleaners.co.uk:21
api.fulhamdrycleaners.co.uk:5900
www.fulhamdrycleaners.co.uk:443
www.fulhamdrycleaners.co.uk:80
www.fulhamdrycleaners.co.uk:22
www.fulhamdrycleaners.co.uk:3306
www.fulhamdrycleaners.co.uk:21
www.fulhamdrycleaners.co.uk:5900

Mutex

K5NJzfq5dpiW

Attributes

delay
3
install
true
install_file
upgrade.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/0x000c000000021422-8.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-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	upgrade.exe

Executes dropped EXE 2 IoCs

pid	Process
2264	upgrade.exe
1904	upgrade.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
4776	cmd.exe
4268	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	upgrade.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	upgrade.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	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	upgrade.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	upgrade.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	upgrade.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
532	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
4548	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe
4748	upgrade.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4748	upgrade.exe
Token: SeDebugPrivilege	2264	upgrade.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4748 wrote to memory of 4776	4748	upgrade.exe	86
PID 4748 wrote to memory of 4268	4748	upgrade.exe	88
PID 4268 wrote to memory of 532	4268	cmd.exe	90
PID 4776 wrote to memory of 4548	4776	cmd.exe	91
PID 4268 wrote to memory of 1904	4268	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\upgrade.exe
"C:\Users\Admin\AppData\Local\Temp\upgrade.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4748
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "upgrade" /tr '"C:\Users\Admin\AppData\Roaming\upgrade.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4776
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "upgrade" /tr '"C:\Users\Admin\AppData\Roaming\upgrade.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4548
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD9F0.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4268
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:532
- - C:\Users\Admin\AppData\Roaming\upgrade.exe
    "C:\Users\Admin\AppData\Roaming\upgrade.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1904

C:\Users\Admin\AppData\Roaming\upgrade.exe
"C:\Users\Admin\AppData\Roaming\upgrade.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2264

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

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

upgrade.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\upgrade.exe.log
Size 522B
SHA256 2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b
MD5 acc9090417037dfa2a55b46ed86e32b8
SHA1 53fa6fb25fb3e88c24d2027aca6ae492b2800a4d
SHA512 d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b
TLSH
T11EF097303722E1E489423F521C1C3A9943EF079AA360EE2C3958036ED825227AB212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmpD9F0.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpD9F0.tmp.bat
Size 151B
SHA256 186c19dcb118d17bdb8f27a89f192b6006027efbb65baf5bc9a8b8824e4281a9
MD5 d10cde7cc3a344d3e7aba612761ea84d
SHA1 392a9adef8f3194c9d1b807fb45191f2f36cf7a0
SHA512 ac5746c6de7354f16bb750ad72d79e6ebbfc7e05e7c4ce7220da39c38b652da7fed36f98c37604ccd293af4c25f0d138bc67d256d7ade899488b74815dcddfaf
TLSH
T13FC08C42A1C5AA1E2905142702BAA48E91A2A8993E40AB108B04808A62C0888E0DA343
MD5 SHA1 SHA512 TLSH

Submit Download

upgrade.exe

Path C:\Users\Admin\AppData\Roaming\upgrade.exe
Size 112KB
SHA256 8a9c3f8187497cdd1eb45c4718382a458934af2e08dd29547257d75cd12b924a
MD5 e810c2d1e991cf1016e3aab47d36da2d
SHA1 a16101328fde25bffe673e8a87fabaf64c152f40
SHA512 18288ed70a6935085b05d87b17059f692ab1878eb5bcf418cd3cf7c72d2a7528ac0e010d1f7e1f78bf1c82863b510dd36e0d7d37f090b823641db99d3782536e
SSDEEP 1536:7uTO9TgQCv2IK0efbDXShyia6E4d6tKrqi35Rwa3:7uTaTg7v2r0efbDl4pPwa3
TLSH
T11CB39F30EFD7B03AED6D4AFC5CA371714925A9D3250EF57AFCC0328716226C1A5326A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4748-0-0x0000000000C10000-0x0000000000C32000-memory.dmp

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memory/4748-1-0x0000000005670000-0x0000000005680000-memory.dmp

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memory/4748-2-0x0000000005680000-0x000000000571C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads