MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9. 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: 6


Intelligence 6 IOCs YARA 20 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9
SHA3-384 hash: 5b07c025992f5528842f0afbcf2805eb6b32da7552bb9b1c02cf5c9d26e93078e13b8cf576400b125712334dd7e5d152
SHA1 hash: d4f3f2b6b19a0ab01be4c75c43a6897fb2a4e57c
MD5 hash: adaa5e7b737546312bc7ce47b265cdb3
humanhash: speaker-batman-snake-ohio
File name:FVN001-230824.pdf.arj
Download: download sample
Signature Formbook
Create hunting rule
File size:662'187 bytes
First seen:2024-04-29 13:08:20 UTC
Last seen:2024-04-29 13:38:29 UTC
File type: arj
MIME type:application/x-rar
ssdeep 12288:4QJqkgSSPdTTA3yWEx/nAx2A4OTvmNuY3S9hF3V6cmE1Cxg0J:4QJFJSdTTCrEBAIA4Ozm3iT6jF
TLSH T1ECE433B32E578339846572F9FD8B4231A326C25EC8CFE06FA77108555816B4AEE48F35
TrID 61.5% (.RAR) RAR compressed archive (v5.0) (8000/1)
38.4% (.RAR) RAR compressed archive (gen) (5000/1)
Reporter cocaman
Tags:arj FormBook


Avatar
cocaman
Malicious email (T1566.001)
From: "Kim Chung <sales@ahtech.com.cn>" (likely spoofed)
Received: "from ahtech.com.cn (unknown [185.222.58.49]) "
Date: "29 Apr 2024 12:41:17 +0200"
Subject: "NEW INQUIRY-FVN001-230824"
Attachment: "FVN001-230824.pdf.arj"

Intelligence

File Origin
# of uploads :
9
# of downloads :
78
Origin country :
CH CH
File Archive Information

This file archive contains 1 file(s), sorted by their relevance:

File name:FVN001-230824.pdf.exe
File size:714'752 bytes
SHA256 hash: 36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee
MD5 hash: c886350c4259dd843104cd51524770a0
MIME type:application/x-dosexec
Signature Formbook
Vendor Threat Intelligence
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9
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.
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9/
Threat name:
ByteCode-MSIL.Spyware.Negasteal
Create hunting rule
Status:
Malicious
First seen:
2024-04-29 07:30:43 UTC
File Type:
Binary (Archive)
Extracted files:
14
AV detection:
17 of 24 (70.83%)
Threat level:
  2/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=ie27btpbzeb3ha7xa67okchrynz5jwyuopu53zcohbpdgh3neluq._file
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Formbook
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9

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:AgentTeslaV3
Create hunting rule
Author:ditekshen
Description:AgentTeslaV3 infostealer payload
Rule name:AgentTeslaV5
Create hunting rule
Author:ClaudioWayne
Description:AgentTeslaV5 infostealer payload
Rule name:AgentTesla_DIFF_Common_Strings_01
Create hunting rule
Author:schmidtsz
Description:Identify partial Agent Tesla strings
Rule name:DebuggerCheck__RemoteAPI
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:INDICATOR_EXE_Packed_GEN01
Create hunting rule
Author:ditekSHen
Description:Detect packed .NET executables. Mostly AgentTeslaV4.
Rule name:INDICATOR_SUSPICIOUS_Binary_References_Browsers
Create hunting rule
Author:ditekSHen
Description:Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
Rule name:INDICATOR_SUSPICIOUS_EXE_References_Confidential_Data_Store
Create hunting rule
Author:ditekSHen
Description:Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers
Rule name:INDICATOR_SUSPICIOUS_EXE_References_Messaging_Clients
Create hunting rule
Author:ditekSHen
Description:Detects executables referencing many email and collaboration clients. Observed in information stealers
Rule name:INDICATOR_SUSPICIOUS_EXE_Referenfces_File_Transfer_Clients
Create hunting rule
Author:ditekSHen
Description:Detects executables referencing many file transfer clients. Observed in information stealers
Rule name:INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
Create hunting rule
Author:ditekSHen
Description:Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion
Rule name:INDICATOR_SUSPICIOUS_EXE_VaultSchemaGUID
Create hunting rule
Author:ditekSHen
Description:Detects executables referencing Windows vault credential objects. Observed in infostealers
Rule name:malware_Agenttesla_type2
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Agenttesla in memory
Reference:internal research
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:SUSP_RAR_with_PDF_Script_Obfuscation
Create hunting rule
Author:Florian Roth (Nextron Systems)
Description:Detects RAR file with suspicious .pdf extension prefix to trick users
Reference:Internal Research
Rule name:SUSP_RAR_with_PDF_Script_Obfuscation_RID34A4
Create hunting rule
Author:Florian Roth
Description:Detects RAR file with suspicious .pdf extension prefix to trick users
Reference:Internal Research
Rule name:Windows_Trojan_AgentTesla_ebf431a8
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/attack-chain-leads-to-xworm-and-agenttesla
Rule name:win_agent_tesla_g2
Create hunting rule
Author:Daniel Plohmann <daniel.plohmann@fkie.fraunhofer.de>

File information

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

Malspam

Formbook

arj 4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9

(this sample)

Formbook

Executable exe 36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee

  
Delivery method
Distributed via e-mail attachment
  
Dropping
SHA256 36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee
  
Dropping
Formbook
  
Dropping
MD5 c886350c4259dd843104cd51524770a0

Comments