asyncrat | 821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1

Analysis

max time kernel
122s
max time network
147s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
05/04/2024, 01:28

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General

Target
821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe
Size 1.2MB
Sample240405-bv5glahb39
SHA256 821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1
MD5 a8884d5c23826a156a79a2e40ddbc10f
SHA1 17ba269221f5e728a768f0e19bd1acf8759f44ac
SHA512 8f14f18e84aac4643655994e6d11d1c166607beadbecc9cc969afa0a5e5881df4cf3c74c77f1de092240369e0922da52574108a358b04a3043d450a77191fedd
SSDEEP 1536:67ja7Fg3dR05lpUFpILxwr1088AEUHXTit6oAfMOnYZm/ZMp+E1U793K7nadtU4s:6QiRGpUcwrXLEKXTToMMIYU60gqtU4s
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat rat15 evasion rat spyware stealer trojan

Malware Config

Extracted

Family

asyncrat

Version

| Edit 3LOSH RAT

Botnet

RAT15

darkstorm275991.ddns.net:6606
darkstorm275991.ddns.net:7707
darkstorm275991.ddns.net:8808
mrreport.duckdns.org:6606
mrreport.duckdns.org:7707
mrreport.duckdns.org:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
Windows Session Manager.exe
install_folder
%AppData%

aes.plain

Signatures

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/0x000b000000013a88-6.dat	family_asyncrat

Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs. 3 IoCs

resource	yara_rule
behavioral1/files/0x000b000000013a88-6.dat	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral1/memory/2252-17-0x0000000000C40000-0x0000000000C56000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral1/memory/1548-41-0x0000000000F90000-0x0000000000FA6000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs

Detects file containing reversed ASEP Autorun registry keys 3 IoCs

resource	yara_rule
behavioral1/files/0x000b000000013a88-6.dat	INDICATOR_SUSPICIOUS_EXE_ASEP_REG_Reverse
behavioral1/memory/2252-17-0x0000000000C40000-0x0000000000C56000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_ASEP_REG_Reverse
behavioral1/memory/1548-41-0x0000000000F90000-0x0000000000FA6000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_ASEP_REG_Reverse

Executes dropped EXE 3 IoCs

pid	Process
2252	Windows Session Manage.exe
2480	Windows Session Manager.exe
1548	Windows Session Manager.exe

Loads dropped DLL 1 IoCs

pid	Process
2132	cmd.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
T1552.001

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
1596	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2136	timeout.exe

Modifies Internet Explorer settings 1 TTPs 33 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\LowRegistry\DontShowMeThisDialogAgain	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Zoom	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\GPU	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\PageSetup	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\SearchScopes\DownloadRetries = "3"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\LowRegistry	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\SearchScopes	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{DDCD1F21-F2EB-11EE-92B8-52226696DE45} = "0"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb01000000abb8596cc50c0546bfda6658dcffc23300000000020000000000106600000001000020000000ef5152968c664bfa4bc4bd95d6fe5c12625e704f25ae23241ea6f0603614bc6e000000000e8000000002000020000000189e05483179c29892c096274a70dca73723c8abe954f4f94d8201da7958cda52000000097e1f3ba887b750a7962c1b9f310fab30b23c03b2d37caad1f955b3fcde0d29840000000c1fe250937c6f2b90acbe2ea6bbe1fcf279f581ad422fec06c56827cf5d929abe999b18870f16844f77347927f2e0620a7560270df1971a45cabb404445d871a	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Toolbar	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\LowMic	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\InternetRegistry	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 5031c5b2f886da01	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\DomainSuggestion	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\IETld\LowMic	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\IntelliForms	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\MFV = 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	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "418442402"	iexplore.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2252	Windows Session Manage.exe
2252	Windows Session Manage.exe
2252	Windows Session Manage.exe
1548	Windows Session Manager.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2252	Windows Session Manage.exe
Token: SeDebugPrivilege	1548	Windows Session Manager.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2612	iexplore.exe

Suspicious use of SetWindowsHookEx 7 IoCs

pid	Process
2612	iexplore.exe
2612	iexplore.exe
2416	IEXPLORE.EXE
2416	IEXPLORE.EXE
2416	IEXPLORE.EXE
2416	IEXPLORE.EXE
1548	Windows Session Manager.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 2208 wrote to memory of 2252	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	28
PID 2208 wrote to memory of 2252	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	28
PID 2208 wrote to memory of 2252	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	28
PID 2208 wrote to memory of 2252	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	28
PID 2208 wrote to memory of 2480	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	29
PID 2208 wrote to memory of 2480	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	29
PID 2208 wrote to memory of 2480	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	29
PID 2208 wrote to memory of 2480	2208	821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe	29
PID 2612 wrote to memory of 2416	2612	iexplore.exe	32
PID 2612 wrote to memory of 2416	2612	iexplore.exe	32
PID 2612 wrote to memory of 2416	2612	iexplore.exe	32
PID 2612 wrote to memory of 2416	2612	iexplore.exe	32
PID 2252 wrote to memory of 2668	2252	Windows Session Manage.exe	34
PID 2252 wrote to memory of 2668	2252	Windows Session Manage.exe	34
PID 2252 wrote to memory of 2668	2252	Windows Session Manage.exe	34
PID 2252 wrote to memory of 2668	2252	Windows Session Manage.exe	34
PID 2252 wrote to memory of 2132	2252	Windows Session Manage.exe	36
PID 2252 wrote to memory of 2132	2252	Windows Session Manage.exe	36
PID 2252 wrote to memory of 2132	2252	Windows Session Manage.exe	36
PID 2252 wrote to memory of 2132	2252	Windows Session Manage.exe	36
PID 2668 wrote to memory of 1596	2668	cmd.exe	38
PID 2668 wrote to memory of 1596	2668	cmd.exe	38
PID 2668 wrote to memory of 1596	2668	cmd.exe	38
PID 2668 wrote to memory of 1596	2668	cmd.exe	38
PID 2132 wrote to memory of 2136	2132	cmd.exe	39
PID 2132 wrote to memory of 2136	2132	cmd.exe	39
PID 2132 wrote to memory of 2136	2132	cmd.exe	39
PID 2132 wrote to memory of 2136	2132	cmd.exe	39
PID 2132 wrote to memory of 1548	2132	cmd.exe	40
PID 2132 wrote to memory of 1548	2132	cmd.exe	40
PID 2132 wrote to memory of 1548	2132	cmd.exe	40
PID 2132 wrote to memory of 1548	2132	cmd.exe	40

C:\Users\Admin\AppData\Local\Temp\821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe
"C:\Users\Admin\AppData\Local\Temp\821900f5cf0981a062d0683d5a5905ce407a035d9e0ab7ee0bd110a7403321d1.exe"
1⤵
- Checks whether UAC is enabled
- Suspicious use of WriteProcessMemory
PID:2208
- C:\Users\Admin\AppData\Local\Windows Session Manage.exe
  "C:\Users\Admin\AppData\Local\Windows Session Manage.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2252
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows Session Manager" /tr '"C:\Users\Admin\AppData\Roaming\Windows Session Manager.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2668
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Windows Session Manager" /tr '"C:\Users\Admin\AppData\Roaming\Windows Session Manager.exe"'
      4⤵
      Creates scheduled task(s)
      PID:1596
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp2CBB.tmp.bat""
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:2132
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:2136
  - - C:\Users\Admin\AppData\Roaming\Windows Session Manager.exe
      "C:\Users\Admin\AppData\Roaming\Windows Session Manager.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:1548
- C:\Users\Admin\AppData\Local\Windows Session Manager.exe
  "C:\Users\Admin\AppData\Local\Windows Session Manager.exe"
  2⤵
  - Executes dropped EXE
  PID:2480

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" -Embedding
1⤵
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2612
- C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2612 CREDAT:275457 /prefetch:2
  2⤵
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:2416

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact