asyncrat | 20da7c750b4c1162896320d3381121eb4bf71a19eee85234e9425d78c92c865c

General

Target
kop.exe
Size 157KB
Sample260504-d73vmsfv8k
SHA256 20da7c750b4c1162896320d3381121eb4bf71a19eee85234e9425d78c92c865c
MD5 8f8743131055e1e181f7d7c4ff527065
SHA1 92ac3b84d67138f1c98d3b6a9764263550f63dad
SHA512 929ebb25605f0921dfb4944fd00807540c3ec5a93ef2d29d34daf2cb7897377ee82b7cbfef8db89f9efc980738854fd67588350d5427e38619679f26731862a0
SSDEEP 3072:gKqV65eA/58HvPiWgA5TZ0rbU6MzuXDE478n0IuLG3qT:jq65j/58P6WgA5dkbLMzmf80IuL9
TLSH
T15CF38A01E0E4AD0ACFCF623610F8DB059590B94EA1779188B9DB60E719FEBD4DCD32A5
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

c2 discovery asyncrat xworm rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

admingdtg.vn:6000
aliexpress.us.com:6000

Mutex

y5IogJoUK72chel2

Attributes

Install_directory
%AppData%
install_file
XClient.exe

aes.plain

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

C2

C2

admingdtg.vn:6606
admingdtg.vn:7707
admingdtg.vn:8808
admingdtg.vn:443
admingdtg.vn:80
admingdtg.vn:22
handyrenuopen.in.net:6606
handyrenuopen.in.net:7707
handyrenuopen.in.net:8808
handyrenuopen.in.net:443
handyrenuopen.in.net:80
handyrenuopen.in.net:22
roofing.gb.net:6606
roofing.gb.net:7707
roofing.gb.net:8808
roofing.gb.net:443
roofing.gb.net:80
roofing.gb.net:22
wplog.jp.net:6606
wplog.jp.net:7707
wplog.jp.net:8808
wplog.jp.net:443
wplog.jp.net:80
wplog.jp.net:22
deepsteam.sa.com:6606
deepsteam.sa.com:7707
deepsteam.sa.com:8808
deepsteam.sa.com:443
deepsteam.sa.com:80
deepsteam.sa.com:22
zsyp.cn.com:6606
zsyp.cn.com:7707
zsyp.cn.com:8808
zsyp.cn.com:443
zsyp.cn.com:80
zsyp.cn.com:22
popcima.it.com:6606
popcima.it.com:7707
popcima.it.com:8808
popcima.it.com:443
popcima.it.com:80
popcima.it.com:22

Mutex

AsyncMutex_6SI8OkPnk

Attributes

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

aes.plain

Signatures

Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Family: Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x00080000000242e3-15.dat	family_asyncrat

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x00120000000241ea-5.dat	family_xworm
behavioral1/memory/1636-25-0x0000000000180000-0x0000000000190000-memory.dmp	family_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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	kop.exe

Executes dropped EXE 2 IoCs

pid	Process
1636	XClient.exe
768	AsyncClient.exe

Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

Web Service

T1102

flow	ioc
3	raw.githubusercontent.com
4	raw.githubusercontent.com

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
5	ip-api.com

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 1 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	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1636	XClient.exe
Token: SeDebugPrivilege	768	AsyncClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4544 wrote to memory of 1636	4544	kop.exe	84
PID 4544 wrote to memory of 768	4544	kop.exe	85

C:\Users\Admin\AppData\Local\Temp\kop.exe
"C:\Users\Admin\AppData\Local\Temp\kop.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4544
- C:\Users\Admin\AppData\Roaming\XClient.exe
  "C:\Users\Admin\AppData\Roaming\XClient.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1636
- C:\Users\Admin\AppData\Roaming\AsyncClient.exe
  "C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:768

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

AsyncClient.exe

Path C:\Users\Admin\AppData\Roaming\AsyncClient.exe
Size 105KB
SHA256 5727a9b00284ca27a4c5c39db58bdc18cfa5e0f79dcf916fe1fee09854eb0e84
MD5 92e7192a42b4521a738e4ff5c1b237b6
SHA1 dd4d33a0a889df9e319d10c5c8ff9d81a587b6ce
SHA512 2f600b1d7ce4b07f6605d8a6bb437b099e5cfd690818957d4b0cccfd722210ca5616ab4ec80712cc5900ce7028769c1287034e1068acf94151dc1d4fdfaf7237
SSDEEP 3072:+uDxTpMESB2xHDy3bCX2kQxztgWKEjBjKV+:+uDkESExG3bIDGeWKmBn
TLSH
T121B39D103BCAB109E1FD5FF06892B255067AAEBBF802D2795CD0774F6612BC4C261EB5
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

XClient.exe

Path C:\Users\Admin\AppData\Roaming\XClient.exe
Size 42KB
SHA256 40a80b253793c4a1cfb8841776291b95ba26e72b586ea8e6c046e039a83648d8
MD5 79b4ed6560e1b0ad81ede7e37af814b3
SHA1 29a87218fbf64de2c3e85a05008924ed4f588b66
SHA512 267d92e5f5104cb45aa4142b30131348842c0d2d5db8f114bc4f6a2f690ecb2f50aaf6c5b1b09e4566f45e3009d369a12354da0b097171e594459612397bcc34
SSDEEP 768:i9WpTAoUTX8Pee6MoG9zfT3m9KJF5Pp9pLh6yOwhL3/JR:aitUTXuee636zTUqFn9lh6yOwxRR
TLSH
T196134C2877D44622E6FEABF41873D2064670E5039D23D78E4CD895AB2B37BC48E417E6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/768-26-0x0000000000490000-0x00000000004B0000-memory.dmp

Download

memory/768-28-0x0000000004D70000-0x0000000004DF7000-memory.dmp

Download

memory/1636-25-0x0000000000180000-0x0000000000190000-memory.dmp

Download

memory/1636-27-0x0000000000920000-0x000000000092C000-memory.dmp

Download

memory/4544-0-0x0000000000C30000-0x0000000000C5E000-memory.dmp

Download

memory/4544-23-0x00000000014F0000-0x00000000014FC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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