MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee. 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: 18

Intelligence 18 IOCs YARA 17 File information Comments

SHA256 hash:	36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee
SHA3-384 hash:	8dd6ff2fbc68b58adb76a28d13781eb3cb407794394e2b7c86d0c2f2e7254a4226ed1943dddb26b9fdf9e57006b3a0e6
SHA1 hash:	595198caebae2f64c3d008425b782e2d7a5f3c00
MD5 hash:	c886350c4259dd843104cd51524770a0
humanhash:	early-robin-texas-stairway
File name:	FVN001-230824.pdf.exe
Download:	download sample
Signature	Formbook Create hunting rule
File size:	714'752 bytes
First seen:	2024-04-29 13:08:26 UTC
Last seen:	2024-04-29 13:38:35 UTC
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep	12288:y+DbgAB778Qe2Y2NW76+Lm+nMO6a4Ti+N5qcQB0omFFUoIglO2+1lyV+Rro7n9m:jgABa+W764t6a4+4LQB0oEFUoIE+1u6k
TLSH	T133E4020172AC9FB6D57A97F0842599410BF3707B6961F64C1EC772CB2A72F808760E6B
TrID	71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 10.2% (.EXE) Win64 Executable (generic) (10523/12/4) 6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 4.3% (.EXE) Win32 Executable (generic) (4504/4/1) 2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Reporter	cocaman
Tags:	exe FormBook

Intelligence

File Origin

# of uploads :

# of downloads :

324

Origin country :

Vendor Threat Intelligence

Malware family:

agenttesla

ID:

File name:

36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee.exe

Verdict:

Malicious activity

Analysis date:

2024-04-29 13:10:38 UTC

Tags:

evasion stealer agenttesla exfiltration

Link:

https://app.any.run/tasks/6c9bf636-497e-469c-bbd7-194e56bf8524

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Launching a process

Creating a file

Using the Windows Management Instrumentation requests

Сreating synchronization primitives

DNS request

Connection attempt

Sending a custom TCP request

Sending an HTTP GET request

Reading critical registry keys

Stealing user critical data

Unauthorized injection to a system process

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

cmd lolbin masquerade packed

Link:

https://www.filescan.io/uploads/662f9bf547bfd8641eba5928/reports/a559c93b-f620-40bf-b61b-b00ef8cf36cc/overview

Verdict:

Malicious

Labled as:

Win/malicious_confidence_100%

Link:

https://www.hybrid-analysis.com/sample/36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee

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:

Agent Tesla

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/2a9aca91-f4a8-4c1f-bcb6-be34407422b1

Result

Threat name:

AgentTesla, PureLog Stealer

Detection:

malicious

Classification:

troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1433358

Signature

.NET source code contains method to dynamically call methods (often used by packers)

.NET source code contains potential unpacker

.NET source code contains very large array initializations

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

Initial sample is a PE file and has a suspicious name

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)

Sigma detected: Suspicious Double Extension File Execution

Snort IDS alert for network traffic

Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)

Tries to harvest and steal browser information (history, passwords, etc)

Tries to harvest and steal ftp login credentials

Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)

Tries to steal Mail credentials (via file / registry access)

Uses an obfuscated file name to hide its real file extension (double extension)

Yara detected AgentTesla

Yara detected AntiVM3

Yara detected Generic Downloader

Yara detected PureLog Stealer

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee

Detection:

agenttesla

Link:

https://mwdb.cert.pl/sample/36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee/

Threat name:

ByteCode-MSIL.Spyware.Negasteal

Status:

Malicious

First seen:

2024-04-29 06:44:16 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

19 of 24 (79.17%)

Threat level:

2/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=g2ch22ui45mkjwbdu3qqa5dmd5ifm6hyykdn3qxjilbdfhgmg3xa._file

Verdict:

malicious

Label(s):

agenttesla_v4

agenttesla

Result

Malware family:

agenttesla

Score:

10/10

Tags:

family:agenttesla keylogger spyware stealer trojan

Link:

https://tria.ge/reports/240429-qdr79sbc62/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious use of SetThreadContext

Looks up external IP address via web service

AgentTesla

Unpacked files

SH256 hash:

e50a90b64f09df89e9350890e8463de75396249124f9975377a9d7e4b18f106b

MD5 hash:

d06b3aadfe7000c741d6aad61f89cb0b

SHA1 hash:

d6948e79c2e2505c7bad722c9b6b52891f5e4ca9

Link:

https://www.unpac.me/results/f292751c-4795-4ec6-a8cd-077e97e8cae3/

SH256 hash:

380ba91ca31f0c895128bd2105bdd7626dd2f1ca96d181c0b4ed089425f54567

MD5 hash:

b69af20fc56fd5b4e52360a6f59265ab

SHA1 hash:

929e61dc9eb469ca42021b510c2e84fc4642f620

Link:

https://www.unpac.me/results/f292751c-4795-4ec6-a8cd-077e97e8cae3/

SH256 hash:

d9cd4bd5f06e2a127f455f3bd684b56fc7d4916c6b659f1c054023fdd1cf200e

MD5 hash:

2297dee2ecf1af9e7fdaa38d6a74524d

SHA1 hash:

5fb8226ee7f2364b06e203e5ded4c929004e7624

Detections:

AgentTesla

win_agent_tesla_g2

INDICATOR_SUSPICIOUS_EXE_Referenfces_File_Transfer_Clients

Agenttesla_type2

INDICATOR_SUSPICIOUS_Binary_References_Browsers

INDICATOR_SUSPICIOUS_EXE_VaultSchemaGUID

INDICATOR_SUSPICIOUS_EXE_References_Messaging_Clients

INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL

INDICATOR_EXE_Packed_GEN01

INDICATOR_SUSPICIOUS_EXE_References_Confidential_Data_Store

Link:

https://www.unpac.me/results/f292751c-4795-4ec6-a8cd-077e97e8cae3/

Parent samples :
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SH256 hash:

5c3a0a6ec7415366bf0cdc6e47889602a3e11010930dc1d81fde2de55ceca29d

MD5 hash:

058320b7212c08664c0234e322838af9

SHA1 hash:

41fe99a33fdf3ed0b09bfcf0f0d42190645f507f

Link:

https://www.unpac.me/results/f292751c-4795-4ec6-a8cd-077e97e8cae3/

SH256 hash:

36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee

MD5 hash:

c886350c4259dd843104cd51524770a0

SHA1 hash:

595198caebae2f64c3d008425b782e2d7a5f3c00

Link:

https://www.unpac.me/results/f292751c-4795-4ec6-a8cd-077e97e8cae3/

Malware family:

AgentTesla

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/36847d6a88e7/report/overview.html

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/36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee

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:	Windows_Trojan_AgentTesla_ebf431a8 Create hunting rule
Author:	Elastic Security
Reference:	https://www.elastic.co/security-labs/attack-chain-leads-to-xworm-and-agenttesla

File information

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

Malspam

Formbook

arj 4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9

Formbook

exe 36847d6a88e758a4d823a6e100746c1f505678f8c286ddc2e942c2329ccc36ee

(this sample)

Delivery method

Other

Dropped by

SHA256 4135f0cde1c903b383f707bee508f1c373d4db1473e9dde44e385e331f6d22e9

Dropped by

MD5 adaa5e7b737546312bc7ce47b265cdb3

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

ID	Title	Severity
CHECK_AUTHENTICODE	Missing Authenticode	high
CHECK_DLL_CHARACTERISTICS	Missing dll Security Characteristics (HIGH_ENTROPY_VA)	high

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