MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


Formbook


Vendor detections: 17


Intelligence 17 IOCs YARA 14 File information Comments
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SHA256 hash: b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633
SHA3-384 hash: 8877f5e163451401334a80037b1ee852c0284707da978376dc97e37a0f2d7f3b1b2bcf255c2c8732d1b94469c191ea8a
SHA1 hash: 4e48607de38ccb23ed81c1d19c8884fec2863ce9
MD5 hash: bc4206081a6f4206dc5b63948b05ef4b
humanhash: vegan-uranus-alanine-crazy
File name:java_update.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:86'016 bytes
First seen:2024-07-02 04:50:06 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 9f4693fc0c511135129493f2161d1e86 (250 x Neshta, 15 x Formbook, 14 x AgentTesla)
ssdeep 1536:yxqjQ+P04wsZLnDrCynM9aR8r8ItiOeF894Fc9U+68OMm:zr8WDrCwM9Ms8ItiOj94Fc9UMOM
TLSH T178838E69BB924532D1FE2FFC5C3252010736BA132E2787AF19E45C9A1E3A7C54908BD6
TrID 79.6% (.EXE) Win32 Executable Borland Delphi 6 (262638/61)
4.3% (.EXE) Win32 Executable Delphi generic (14182/79/4)
3.9% (.SCR) Windows screen saver (13097/50/3)
3.1% (.EXE) Win64 Executable (generic) (10523/12/4)
3.0% (.EXE) DOS Borland compiled Executable (generic) (10000/1/2)
File icon (PE):PE icon
dhash icon c8e4f0f29090f0e8 (1 x Formbook)
Reporter lontze7
Tags:FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
122
Origin country :
GR GR
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633.exe
Verdict:
Malicious activity
Analysis date:
2024-07-02 06:24:50 UTC
Tags:
evasion xworm amsi-bypass
Link:
https://app.any.run/tasks/4192f108-6c93-4bc2-b3fa-7e0fcee8cd4c

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Win.Packed.njRAT-10002074-1
Create hunting rule

Win.Packed.Msilzilla-10019837-0
Create hunting rule

Win.Packed.Loveletter-10023052-0
Create hunting rule

Win.Dropper.Nanocore-10024427-0
Create hunting rule

Win.Packed.Msilzilla-10024501-0
Create hunting rule

Win.Packed.Loveletter-10024677-0
Create hunting rule

Win.Packed.Msilzilla-10024808-0
Create hunting rule

Win.Packed.Msilzilla-10026193-0
Create hunting rule

ditekSHen.MALWARE.Win.Trojan.AsyncRAT.UNOFFICIAL
Create hunting rule

Win.Trojan.Neshta-157
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6683874d251d4687fe42d433win10vpnfull_triage
Tags:
Encryption Execution Generic Infostealer Other Spreading Static Stealth Neshta Neshta
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a file in the %temp% subdirectories
Сreating synchronization primitives
Creating a process from a recently created file
Creating a file in the Windows directory
Modifying an executable file
Using the Windows Management Instrumentation requests
DNS request
Connection attempt
Sending an HTTP GET request
Creating a process with a hidden window
Creating a file in the Program Files subdirectories
Creating a window
Unauthorized injection to a recently created process
Enabling autorun with the shell\open\command registry branches
Infecting executable files
Adding an exclusion to Microsoft Defender
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-vm asyncrat backdoor borland_delphi fingerprint lolbin neshta njrat njrat overlay rat shell32 virus
Link:
https://www.filescan.io/uploads/6683873749a1c830626957f1/reports/d619079b-a6ae-4fbc-b1b8-765d1a4cb6a1/overview
Verdict:
Malicious
Labled as:
Virus.Neshta
Link:
https://www.hybrid-analysis.com/sample/b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Malware family:
XWorm
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/bf5fa0ce-afab-43a6-8ec3-972c59bcc090
Result
Threat name:
AsyncRAT, Neshta, XWorm
Create hunting rule
Detection:
malicious
Classification:
spre.troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1465837
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
AI detected suspicious sample
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Check if machine is in data center or colocation facility
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Contains functionality to log keystrokes (.Net Source)
Creates an undocumented autostart registry key
Drops executable to a common third party application directory
Drops executables to the windows directory (C:\Windows) and starts them
Drops or copies MsMpEng.exe (Windows Defender, likely to bypass HIPS)
Drops PE files with a suspicious file extension
Found malware configuration
Infects executable files (exe, dll, sys, html)
Loading BitLocker PowerShell Module
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Protects its processes via BreakOnTermination flag
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Sample is not signed and drops a device driver
Sample uses string decryption to hide its real strings
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Script Interpreter Execution From Suspicious Folder
Sigma detected: Suspicious Script Execution From Temp Folder
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Yara detected AsyncRAT
Yara detected Generic Downloader
Yara detected Neshta
Yara detected XWorm
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1465837 Sample: java_update.exe Startdate: 02/07/2024 Architecture: WINDOWS Score: 100 64 ip-api.com 2->64 78 Found malware configuration 2->78 80 Malicious sample detected (through community Yara rule) 2->80 82 Antivirus detection for dropped file 2->82 84 20 other signatures 2->84 10 java_update.exe 19 2->10         started        signatures3 process4 file5 54 C:\Windows\svchost.com, PE32 10->54 dropped 56 C:\Users\user\AppData\Local\Temp\chrome.exe, PE32 10->56 dropped 58 C:\Users\user\AppData\...\java_update.exe, PE32 10->58 dropped 60 122 other malicious files 10->60 dropped 94 Creates an undocumented autostart registry key 10->94 96 Drops PE files with a suspicious file extension 10->96 98 Drops or copies MsMpEng.exe (Windows Defender, likely to bypass HIPS) 10->98 100 2 other signatures 10->100 14 java_update.exe 20 6 10->14         started        signatures6 process7 dnsIp8 66 ip-api.com 208.95.112.1, 49730, 80 TUT-ASUS United States 14->66 68 45.141.26.232, 49737, 49739, 49740 SPECTRAIPSpectraIPBVNL Netherlands 14->68 62 C:\...\Java Update Checker (64 bit).exe, PE32 14->62 dropped 70 Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines) 14->70 72 Protects its processes via BreakOnTermination flag 14->72 74 Drops executables to the windows directory (C:\Windows) and starts them 14->74 76 3 other signatures 14->76 19 svchost.com 2 14->19         started        23 svchost.com 14->23         started        25 svchost.com 14->25         started        27 svchost.com 14->27         started        file9 signatures10 process11 file12 46 C:\Program Files (x86)\...\Uninstall.exe, PE32 19->46 dropped 48 C:\Program Files (x86)\...\misc.exe, PE32 19->48 dropped 50 C:\Program Files (x86)\...\misc.exe, PE32 19->50 dropped 52 26 other malicious files 19->52 dropped 86 Bypasses PowerShell execution policy 19->86 88 Adds a directory exclusion to Windows Defender 19->88 90 Sample is not signed and drops a device driver 19->90 92 Infects executable files (exe, dll, sys, html) 19->92 29 powershell.exe 19->29         started        32 powershell.exe 23->32         started        34 powershell.exe 25->34         started        36 powershell.exe 27->36         started        signatures13 process14 signatures15 102 Loading BitLocker PowerShell Module 29->102 38 conhost.exe 29->38         started        40 conhost.exe 32->40         started        42 conhost.exe 34->42         started        44 conhost.exe 36->44         started        process16
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633/
Threat name:
Win32.Trojan.AsyncRAT
Create hunting rule
Status:
Malicious
First seen:
2024-06-25 10:56:23 UTC
File Type:
PE (Exe)
Extracted files:
2
AV detection:
24 of 24 (100.00%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=w5y2ms57z2bde4iikhvbh5kartbicm5mau376eyjy5e45bpueyzq._file
Verdict:
malicious
Result
Malware family:
xworm
Create hunting rule
Score:
  10/10
Tags:
family:neshta family:xworm execution persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/240702-fgtkdswgpb/
Behaviour
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in Program Files directory
Drops file in Windows directory
Looks up external IP address via web service
Checks computer location settings
Drops startup file
Executes dropped EXE
Loads dropped DLL
Modifies system executable filetype association
Reads user/profile data of web browsers
Command and Scripting Interpreter: PowerShell
Detect Xworm Payload
Neshta
Xworm
Malware Config
C2 Extraction:
45.141.26.232:6666
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/bc8213b8-34b5-4f3f-8cc0-039f2b0bdbf7
Unpacked files
SH256 hash:
b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633
MD5 hash:
bc4206081a6f4206dc5b63948b05ef4b
SHA1 hash:
4e48607de38ccb23ed81c1d19c8884fec2863ce9
Detections:
win_neshta_auto
Create hunting rule
MAL_Malware_Imphash_Mar23_1
Create hunting rule
MAL_Neshta_Generic
Create hunting rule
MALWARE_Win_XWorm
Create hunting rule
win_mal_XWorm
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
Create hunting rule
MALWARE_Win_AsyncRAT
Create hunting rule
Link:
https://www.unpac.me/results/1a52e370-0985-42d6-95eb-5e1e968eb0c2/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Borland
Create hunting rule
Author:malware-lu
Rule name:ByteCode_MSIL_Backdoor_AsyncRAT
Create hunting rule
Author:ReversingLabs
Description:Yara rule that detects AsyncRAT backdoor.
Rule name:DebuggerCheck__RemoteAPI
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Disable_Defender
Create hunting rule
Author:iam-py-test
Description:Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen
Rule name:INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
Create hunting rule
Author:ditekSHen
Description:Detects Windows executables referencing non-Windows User-Agents
Rule name:MALWARE_Win_AsyncRAT
Create hunting rule
Author:ditekSHen
Description:Detects AsyncRAT
Rule name:MALWARE_Win_XWorm
Create hunting rule
Author:ditekSHen
Description:Detects XWorm
Rule name:MAL_Malware_Imphash_Mar23_1
Create hunting rule
Author:Arnim Rupp
Description:Detects malware by known bad imphash or rich_pe_header_hash
Reference:https://yaraify.abuse.ch/statistics/
Rule name:MAL_Neshta_Generic
Create hunting rule
Author:Florian Roth (Nextron Systems)
Description:Detects Neshta malware
Reference:Internal Research
Rule name:MAL_Neshta_Generic_RID2DC9
Create hunting rule
Author:Florian Roth
Description:Detects Neshta malware
Reference:Internal Research
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:Njrat
Create hunting rule
Author:botherder https://github.com/botherder
Description:Njrat
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:win_neshta_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:autogenerated rule brought to you by yara-signator

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

Formbook

Executable exe b771a64bbfce8232710851ea13f5408cc28133ac0537ff1309c749ce85f42633

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2917691/
  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/2918459/

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_NXMissing Non-Executable Memory Protectioncritical
CHECK_PIEMissing Position-Independent Executable (PIE) Protectionhigh
Reviews
IDCapabilitiesEvidence
MULTIMEDIA_APICan Play Multimediagdi32.dll::StretchDIBits
SHELL_APIManipulates System Shellshell32.dll::ShellExecuteA
WIN32_PROCESS_APICan Create Process and Threadskernel32.dll::CloseHandle
WIN_BASE_APIUses Win Base APIkernel32.dll::GetDriveTypeA
kernel32.dll::GetStartupInfoA
kernel32.dll::GetCommandLineA
WIN_BASE_EXEC_APICan Execute other programskernel32.dll::WinExec
WIN_BASE_IO_APICan Create Fileskernel32.dll::CreateDirectoryA
kernel32.dll::CreateFileA
kernel32.dll::DeleteFileA
kernel32.dll::GetWindowsDirectoryA
kernel32.dll::GetFileAttributesA
kernel32.dll::FindFirstFileA
WIN_REG_APICan Manipulate Windows Registryadvapi32.dll::RegOpenKeyExA
advapi32.dll::RegQueryValueExA
advapi32.dll::RegSetValueExA

Comments