asyncrat | ac601a34b6e00a6409580aa29283f241b44a33785757354c846b3df4a3bf676f

Analysis

max time kernel
136s
max time network
150s
platform
windows10_x64
resource
win10-en-20211104
submitted
15/11/2021, 07:24

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General

Target
736aa6026a89fedde2c507de5789c81e.exe
Size 495KB
Sample211115-h8dz5aedfl
SHA256 ac601a34b6e00a6409580aa29283f241b44a33785757354c846b3df4a3bf676f
MD5 736aa6026a89fedde2c507de5789c81e
SHA1 527e4fcdb32a1f67641f3b4a1dfb71253ff0f3c7
SHA512 f0648ddc947d07011c09c474c4126c3c39c1b102d1e7adb7dc5ddf6156999d25312df5dc282dfa842af5af39a7bc5f0aa0818fdf8810eea4eceb614d74559bcd
MD5 SHA1 SHA512

Score

10^/10

asyncrat snakekeylogger nov collection keylogger rat spyware stealer suricata

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

bbccdd.duckdns.org:1616

Mutex

AsyncMutex_6SI9741001021OkPnk

Attributes

anti_vm
false
bsod
false
delay
3
install
false
install_folder
%AppData%
pastebin_config
null

aes.plain

Extracted

Family

snakekeylogger

Credentials

Protocol
smtp
Host
budgetn.shop
Port
587
Username
[email protected]
Password
s)Z4bO(8nKHT

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
stealer keylogger snakekeylogger
suricata: ET MALWARE Observed Malicious SSL Cert (AsyncRAT Server)
suricata: ET MALWARE Observed Malicious SSL Cert (AsyncRAT Server)
suricata

Async RAT payload 5 IoCs

rat

resource	yara_rule
behavioral2/memory/832-140-0x0000000000401190-mapping.dmp	asyncrat
behavioral2/memory/832-139-0x0000000000400000-0x0000000000430000-memory.dmp	asyncrat
behavioral2/memory/832-145-0x0000000000400000-0x0000000000430000-memory.dmp	asyncrat
behavioral2/files/0x000400000001abb7-147.dat	asyncrat
behavioral2/files/0x000400000001abb7-148.dat	asyncrat

Executes dropped EXE 4 IoCs

pid	Process
1876	office.exe
832	office.exe
1912	FB_AB4B.tmp.exe
1892	FB_AD9D.tmp.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
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

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	FB_AD9D.tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	FB_AD9D.tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	FB_AD9D.tmp.exe

Looks up external IP address via web service 3 IoCs

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

flow	ioc
30	checkip.dyndns.org
32	freegeoip.app
33	freegeoip.app

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3664 set thread context of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 1876 set thread context of 832	1876	office.exe	78

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
596	schtasks.exe
1440	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1892	FB_AD9D.tmp.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3664	736aa6026a89fedde2c507de5789c81e.exe
Token: SeDebugPrivilege	1876	office.exe
Token: SeDebugPrivilege	1892	FB_AD9D.tmp.exe
Token: SeDebugPrivilege	1912	FB_AB4B.tmp.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 592	3664	736aa6026a89fedde2c507de5789c81e.exe	69
PID 3664 wrote to memory of 1500	3664	736aa6026a89fedde2c507de5789c81e.exe	70
PID 3664 wrote to memory of 1500	3664	736aa6026a89fedde2c507de5789c81e.exe	70
PID 3664 wrote to memory of 1500	3664	736aa6026a89fedde2c507de5789c81e.exe	70
PID 3664 wrote to memory of 3432	3664	736aa6026a89fedde2c507de5789c81e.exe	71
PID 3664 wrote to memory of 3432	3664	736aa6026a89fedde2c507de5789c81e.exe	71
PID 3664 wrote to memory of 3432	3664	736aa6026a89fedde2c507de5789c81e.exe	71
PID 1500 wrote to memory of 596	1500	cmd.exe	74
PID 1500 wrote to memory of 596	1500	cmd.exe	74
PID 1500 wrote to memory of 596	1500	cmd.exe	74
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 832	1876	office.exe	78
PID 1876 wrote to memory of 1032	1876	office.exe	79
PID 1876 wrote to memory of 1032	1876	office.exe	79
PID 1876 wrote to memory of 1032	1876	office.exe	79
PID 1876 wrote to memory of 1088	1876	office.exe	80
PID 1876 wrote to memory of 1088	1876	office.exe	80
PID 1876 wrote to memory of 1088	1876	office.exe	80
PID 1032 wrote to memory of 1440	1032	cmd.exe	83
PID 1032 wrote to memory of 1440	1032	cmd.exe	83
PID 1032 wrote to memory of 1440	1032	cmd.exe	83
PID 832 wrote to memory of 1912	832	office.exe	84
PID 832 wrote to memory of 1912	832	office.exe	84
PID 832 wrote to memory of 1912	832	office.exe	84
PID 832 wrote to memory of 1892	832	office.exe	85
PID 832 wrote to memory of 1892	832	office.exe	85
PID 832 wrote to memory of 1892	832	office.exe	85

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	FB_AD9D.tmp.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	FB_AD9D.tmp.exe

C:\Users\Admin\AppData\Local\Temp\736aa6026a89fedde2c507de5789c81e.exe
"C:\Users\Admin\AppData\Local\Temp\736aa6026a89fedde2c507de5789c81e.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3664
- C:\Users\Admin\AppData\Local\Temp\736aa6026a89fedde2c507de5789c81e.exe
  "C:\Users\Admin\AppData\Local\Temp\736aa6026a89fedde2c507de5789c81e.exe"
  2⤵
  PID:592
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\office\office.exe'" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1500
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\office\office.exe'" /f
    3⤵
    - Creates scheduled task(s)
    PID:596
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c copy "C:\Users\Admin\AppData\Local\Temp\736aa6026a89fedde2c507de5789c81e.exe" "C:\Users\Admin\AppData\Roaming\office\office.exe"
  2⤵
  PID:3432

C:\Users\Admin\AppData\Roaming\office\office.exe
C:\Users\Admin\AppData\Roaming\office\office.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1876
- C:\Users\Admin\AppData\Roaming\office\office.exe
  "C:\Users\Admin\AppData\Roaming\office\office.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:832
- - C:\Users\Admin\AppData\Local\Temp\FB_AB4B.tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\FB_AB4B.tmp.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1912
- - C:\Users\Admin\AppData\Local\Temp\FB_AD9D.tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\FB_AD9D.tmp.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - outlook_office_path
    - outlook_win_path
    PID:1892
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\office\office.exe'" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1032
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\office\office.exe'" /f
    3⤵
    - Creates scheduled task(s)
    PID:1440
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c copy "C:\Users\Admin\AppData\Roaming\office\office.exe" "C:\Users\Admin\AppData\Roaming\office\office.exe"
  2⤵
  PID:1088

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

memory/832-145-0x0000000000400000-0x0000000000430000-memory.dmp

Download

memory/832-139-0x0000000000400000-0x0000000000430000-memory.dmp

Download

memory/1876-138-0x0000000005420000-0x0000000005421000-memory.dmp

Download

memory/1876-132-0x0000000000F80000-0x0000000000F81000-memory.dmp

Download

memory/1892-154-0x0000000000E10000-0x0000000000E11000-memory.dmp

Download

memory/1892-159-0x0000000006A00000-0x0000000006A01000-memory.dmp

Download

memory/1892-158-0x00000000055D0000-0x000000000566C000-memory.dmp

Download

memory/1892-157-0x0000000005670000-0x0000000005671000-memory.dmp

Download

memory/1912-150-0x0000000000FD0000-0x0000000000FD1000-memory.dmp

Download

memory/1912-162-0x0000000003280000-0x0000000003281000-memory.dmp

Download

memory/3664-118-0x0000000000290000-0x0000000000291000-memory.dmp

Download

memory/3664-121-0x00000000053B0000-0x00000000053B1000-memory.dmp

Download

memory/3664-120-0x0000000005810000-0x0000000005811000-memory.dmp

Download

memory/3664-122-0x0000000005450000-0x0000000005451000-memory.dmp

Download

memory/3664-123-0x0000000005370000-0x0000000005371000-memory.dmp

Download

memory/3664-124-0x00000000052F0000-0x00000000052F1000-memory.dmp

Download