MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c. 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: a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c
SHA3-384 hash: 8b24ec5aa104a3399fe69d7da04f0604852305f502240d03a7e44998967a1a6ed94a30e08424b46f206dd9cb2a441fd8
SHA1 hash: 8cbeb48832356f7cff9b1370ece879d72b8eb156
MD5 hash: 5ad0a139daa10def6783d34a578882eb
humanhash: quiet-butter-bluebird-music
File name:Ulg Bypas.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:123'904 bytes
First seen:2024-06-20 15:08:21 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'657 x AgentTesla, 19'469 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 1536:S0DwewicrbsN/YVRrNRF49IG6iOwjaClJEHIl7pmhaKI:S0DweDN/kr/F49IaOw5Ch0
TLSH T192C372156FD4CCC2E2BE51F89CB1F6284625A5680A278D09EDFD65EBF2E8F805C3510E
TrID 67.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
9.7% (.EXE) Win64 Executable (generic) (10523/12/4)
6.0% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
4.1% (.EXE) Win32 Executable (generic) (4504/4/1)
File icon (PE):PE icon
dhash icon cc9e1b594d338ecc (1 x Formbook)
Reporter Chainskilabs
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
338
Origin country :
RO RO
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c.exe
Verdict:
Malicious activity
Analysis date:
2024-06-20 15:10:49 UTC
Tags:
xworm evasion remote
Link:
https://app.any.run/tasks/c58e5e94-d663-484a-b68f-993e026f128a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Win.Packed.njRAT-10002074-1
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Win.Packed.Msilzilla-10002982-0
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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
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Win.Packed.Msilzilla-10026193-0
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ditekSHen.MALWARE.Win.Trojan.AsyncRAT.UNOFFICIAL
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Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=667446b10f8138dd4eb1d902win7simulatehigh_evasion
Tags:
Banker Encryption Execution Network Stealth Dexter
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Сreating synchronization primitives
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 %AppData% directory
Launching a process
Creating a window
Connecting to a non-recommended domain
Creating a process from a recently created file
Creating a file
Sending a custom TCP request
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Setting a global event handler for the keyboard
Adding an exclusion to Microsoft Defender
Enabling autorun by creating a file
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-vm asyncrat backdoor fingerprint hook keylogger lolbin njrat rat schtasks vbnet
Link:
https://www.filescan.io/uploads/6674460f49a1c8306267b62b/reports/6ed2232d-122b-4d7d-b826-6ac69189f4e0/overview
Verdict:
Malicious
Labled as:
Jalapeno.Generic
Link:
https://www.hybrid-analysis.com/sample/a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c
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
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Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/65480962-e00f-4599-98c9-e26e5db0e904
Result
Threat name:
AsyncRAT, XWorm
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Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1460212
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)
Found malware configuration
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 uses string decryption to hide its real strings
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Snort IDS alert for network traffic
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AsyncRAT
Yara detected Generic Downloader
Yara detected XWorm
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1460212 Sample: Ulg Bypas.exe Startdate: 20/06/2024 Architecture: WINDOWS Score: 100 40 sekoneko.zapto.org 2->40 42 ip-api.com 2->42 48 Snort IDS alert for network traffic 2->48 50 Found malware configuration 2->50 52 Malicious sample detected (through community Yara rule) 2->52 54 20 other signatures 2->54 8 Ulg Bypas.exe 15 6 2->8         started        13 win64.exe 2->13         started        15 win64.exe 2->15         started        17 2 other processes 2->17 signatures3 process4 dnsIp5 44 ip-api.com 208.95.112.1, 49731, 80 TUT-ASUS United States 8->44 46 sekoneko.zapto.org 102.44.91.201, 1111, 49739 TE-ASTE-ASEG Egypt 8->46 38 C:\Users\user\AppData\Roaming\win64.exe, PE32 8->38 dropped 58 Protects its processes via BreakOnTermination flag 8->58 60 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 8->60 62 Adds a directory exclusion to Windows Defender 8->62 19 powershell.exe 23 8->19         started        22 powershell.exe 23 8->22         started        24 powershell.exe 20 8->24         started        26 2 other processes 8->26 64 Antivirus detection for dropped file 13->64 66 Multi AV Scanner detection for dropped file 13->66 68 Machine Learning detection for dropped file 13->68 file6 signatures7 process8 signatures9 56 Loading BitLocker PowerShell Module 19->56 28 conhost.exe 19->28         started        30 conhost.exe 22->30         started        32 conhost.exe 24->32         started        34 conhost.exe 26->34         started        36 conhost.exe 26->36         started        process10
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c
Detection:
xworm
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Link:
https://mwdb.cert.pl/sample/a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c/
Threat name:
ByteCode-MSIL.Trojan.AsyncRAT
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Status:
Malicious
First seen:
2024-06-20 15:09:07 UTC
File Type:
PE (.Net Exe)
Extracted files:
3
AV detection:
22 of 24 (91.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=u6eklnabmyp7dq7o3uq5m6omv442gxfruwubi5z3dzg62sg6rega._file
Verdict:
malicious
Result
Malware family:
xworm
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Score:
  10/10
Tags:
family:xworm execution persistence rat trojan
Link:
https://tria.ge/reports/240620-sjf4asyalp/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Enumerates physical storage devices
Adds Run key to start application
Looks up external IP address via web service
Checks computer location settings
Drops startup file
Executes dropped EXE
Command and Scripting Interpreter: PowerShell
Detect Xworm Payload
Xworm
Malware Config
C2 Extraction:
sekoneko.zapto.org:1111
Verdict:
Unknown
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/eae96ce7-8d21-44b6-9115-e8a39e0ff1c7
Unpacked files
SH256 hash:
a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c
MD5 hash:
5ad0a139daa10def6783d34a578882eb
SHA1 hash:
8cbeb48832356f7cff9b1370ece879d72b8eb156
Detections:
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/0edfc4d3-cdf6-4bac-bf8f-4815c2962582/
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/a788a5b401661ff1c3eedd21d679ccaf39a35cb1a5a814773b1e4ded48de890c

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:ByteCode_MSIL_Backdoor_AsyncRAT
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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:EXE_RAT_XWorm_April2024
Create hunting rule
Author:Yashraj Solanki - Cyber Threat Intelligence Analyst at Bridewell
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:Multifamily_RAT_Detection
Create hunting rule
Author:Lucas Acha (http://www.lukeacha.com)
Description:Generic Detection for multiple RAT families, PUPs, Packers and suspicious executables
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:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:SUSP_DOTNET_PE_List_AV
Create hunting rule
Author:SECUINFRA Falcon Team
Description:Detecs .NET Binary that lists installed AVs
Rule name:win_xworm_bytestring
Create hunting rule
Author:Matthew @ Embee_Research
Description:Detects bytestring present in unobfuscated xworm

File information

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

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_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high

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