asyncrat | b20bdd03ad605edafccbed9cbf281d1fd370116dd07e335fc2f428e9efb2863b

General

Target

tmp.exe
Size

479KB
MD5

4c6b01344809054252095695fe24aa5f
SHA1

d1571b19723ebb0def5a71b7d977ef4c5bdb66ab
SHA256

b20bdd03ad605edafccbed9cbf281d1fd370116dd07e335fc2f428e9efb2863b
SHA512

a26600e8233e90034a3a731246bdc634bc30478ea995c37317ef2e8139200f09446c4b78b500ffec5d7a84045790d0e80d20e4ba58cf28f0e4358f80e1db3af0

Score

10^/10

asyncrat neshta default persistence rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

secureyourdataarea1.duckdns.org:56390

Mutex

AsyncMutex_6SI8OkPnk

Attributes

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

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
Modifies system executable filetype association 2 TTPs 1 IoCs
persistence

Modify Registry
T1112

Change Default File Association
T1042

Processes:

tmp.exe

description ioc process

Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*" tmp.exe
Neshta
Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.
persistence spyware neshta

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*"	tmp.exe

Async RAT payload 6 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1176-75-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1176-73-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1176-70-0x000000000040C74E-mapping.dmp	asyncrat
behavioral1/memory/1176-69-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1176-68-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1176-67-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

tmp.exetmp.exe

pid process

2024 tmp.exe
1176 tmp.exe
Loads dropped DLL 3 IoCs

Processes:

tmp.exetmp.exe

pid process

1072 tmp.exe
1072 tmp.exe
2024 tmp.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Suspicious use of SetThreadContext 1 IoCs

Processes:

tmp.exe

description pid process target process

PID 2024 set thread context of 1176 2024 tmp.exe tmp.exe

pid	process
2024	tmp.exe
1176	tmp.exe

pid	process
1072	tmp.exe
1072	tmp.exe
2024	tmp.exe

description	pid	process	target process
PID 2024 set thread context of 1176	2024	tmp.exe	tmp.exe

Drops file in Program Files directory 64 IoCs

Processes:

tmp.exe

description	ioc	process
File opened for modification	C:\PROGRA~2\Adobe\READER~1.0\Reader\ADOBEC~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\TextConv\WksConv\Wkconv.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\PPTICO.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\READER~1.0\Reader\AcroRd32.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\MSInfo\msinfo32.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\OFFICE14\MSOICONS.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GO664E~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\INTERN~1\ieinstal.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\MSOUC.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmpconfig.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\READER~1.0\Resource\Icons\SC_REA~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\BCSSync.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\setup_wm.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmprph.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~2.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\OIS.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\ImagingDevices.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\OFFICE14\FLTLDR.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOF5E2~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\CNFNOT32.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\GROOVEMN.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MOZILL~1\MAINTE~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MOZILL~1\UNINST~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\READER~1.0\Reader\Eula.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\READER~1.0\SETUPF~1\{AC76B~1\Setup.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Adobe\Updater6\ADOBEU~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\EQUATION\EQNEDT32.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\OFFICE14\LICLUA.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~3.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOOGLE~4.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\1033\ONELEV.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~1\wabmig.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmpshare.exe	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{4D8DC~1\VC_RED~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{EF6B0~1\VCREDI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Adobe\READER~1.0\Reader\A3DUTI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\GRAPH.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\MSTORE.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\XLICONS.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~2\ACCESS~1\wordpad.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\DW\DW20.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\OFFICE14\MSOXMLED.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\VSTO\10.0\VSTOIN~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\DISABL~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\MSQRY32.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\WINWORD.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmplayer.exe	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{61087~1\VCREDI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\ADOBEA~1\Versions\1.0\ADOBEA~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\ink\mip.exe	tmp.exe
File opened for modification	C:\PROGRA~2\Google\Update\1336~1.71\GOBD5D~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\INTERN~1\iexplore.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\MSTORDB.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\WINDOW~1\wab.exe	tmp.exe
File opened for modification	C:\PROGRA~2\WI4223~1\sidebar.exe	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\DW\DWTRIG20.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\OFFICE14\OFFICE~1\Setup.exe	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\CLVIEW.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\WORDICON.EXE	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{57A73~1\VC_RED~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{CA675~1\VCREDI~1.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\MICROS~1\Office14\MSOHTMED.EXE	tmp.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\OFFICE14\Oarpmany.exe	tmp.exe

Drops file in Windows directory 1 IoCs

Processes:

tmp.exe

description ioc process

File opened for modification C:\Windows\svchost.com tmp.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

tmp.exe

description ioc process

Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*" tmp.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

tmp.exetmp.exe

description pid process

Token: SeDebugPrivilege 2024 tmp.exe
Token: SeDebugPrivilege 1176 tmp.exe

description	ioc	process
File opened for modification	C:\Windows\svchost.com	tmp.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*"	tmp.exe

description	pid	process
Token: SeDebugPrivilege	2024	tmp.exe
Token: SeDebugPrivilege	1176	tmp.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

tmp.exetmp.exe

description	pid	process	target process
PID 1072 wrote to memory of 2024	1072	tmp.exe	tmp.exe
PID 1072 wrote to memory of 2024	1072	tmp.exe	tmp.exe
PID 1072 wrote to memory of 2024	1072	tmp.exe	tmp.exe
PID 1072 wrote to memory of 2024	1072	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe
PID 2024 wrote to memory of 1176	2024	tmp.exe	tmp.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Modifies system executable filetype association
- Loads dropped DLL
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1072
- C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2024
- - C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe
    0
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1176

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Change Default File Association

1

T1042

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
C:\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
\PROGRA~2\Adobe\READER~1.0\Reader\LOGTRA~1.EXE

Filesize
252KB

MD5
9e2b9928c89a9d0da1d3e8f4bd96afa7

SHA1
ec66cda99f44b62470c6930e5afda061579cde35

SHA256
8899b4ed3446b7d55b54defbc1acb7c5392a4b3bc8ec2cdc7c31171708965043

SHA512
2ca5ad1d0e12a8049de885b90b7f56fe77c868e0d6dae4ec4b6f3bc0bf7b2e73295cc9b1328c2b45357ffb0d7804622ab3f91a56140b098e93b691032d508156

Download Submit
\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
\Users\Admin\AppData\Local\Temp\3582-490\tmp.exe

Filesize
438KB

MD5
61f89c90f92b2579d100f2af29f8375b

SHA1
94b645443699532b764963a6340dc2001de78146

SHA256
531a2ee7e49f863969f2e353cfc0d62117d4857c9cf3784fa387c72a9911b757

SHA512
fadb57106257333e6e34de9f7a47ca99b1aa628ddb4d973b088a66e3d7d7dda339a680204671bedf96aab68adaeb3797f82c06743dd550eb71d3f850e4214715

Download Submit
memory/1072-54-0x0000000076321000-0x0000000076323000-memory.dmp

Filesize
8KB

Download
memory/1176-69-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1176-75-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1176-73-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1176-70-0x000000000040C74E-mapping.dmp

Download
memory/1176-68-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1176-67-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1176-65-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1176-64-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2024-62-0x00000000002D0000-0x000000000030C000-memory.dmp

Filesize
240KB

Download
memory/2024-59-0x0000000000AA0000-0x0000000000B14000-memory.dmp

Filesize
464KB

Download
memory/2024-56-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads