MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731. 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


AgentTesla


Vendor detections: 16


Intelligence 16 IOCs YARA 18 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731
SHA3-384 hash: 812acf21cc9ba917ddbc7934375638ae2b6f6668973ac67630c37fc2dbf7a93619a6990712d6738181369c74e9beb66d
SHA1 hash: f717df8434925d25e03512c91385bc528576339e
MD5 hash: 43a00ef10637139c060f1139df3b9cc1
humanhash: mike-finch-north-magnesium
File name:Ynstr.exe
Download: download sample
Signature AgentTesla
Create hunting rule
File size:735'232 bytes
First seen:2024-02-12 12:01:06 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 12288:RCcj8EhT1GrAjbadQSIVCXfUWQBZoeAfeDlV25x3nGxYcBa8k:Icj8EzCdQSIkXsWQE4lV259Gx
TLSH T104F4CF1963254D22DB73A774D973E6051905CDBB88CBA34763C8A47BA03B2BF1BE1706
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 lowmal3
Tags:AgentTesla exe

Intelligence

File Origin
# of uploads :
1
# of downloads :
317
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731.exe
Verdict:
Malicious activity
Analysis date:
2024-02-12 12:03:15 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/e7270925-190c-48b8-a03c-202cb33f44a1

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/475825/
Detection(s):
Win.Trojan.EmbeddedDotNetBinary-9940868-0
Create hunting rule

Win.Trojan.EmbeddedReversedDLL-9940922-0
Create hunting rule

Win.Trojan.Generic-10014419-0
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %AppData% directory
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Using the Windows Management Instrumentation requests
Сreating synchronization primitives
DNS request
Connection attempt
Sending a custom TCP request
Creating a file in the %AppData% subdirectories
Reading critical registry keys
Creating a window
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Stealing user critical data
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
packed
Link:
https://www.filescan.io/uploads/65ca08bd179f724a9550006c/reports/1b7c4b7f-271d-445f-bf72-5699a1d180d8/overview
Verdict:
Malicious
Labled as:
MSILHeracles.Generic
Link:
https://www.hybrid-analysis.com/sample/f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731
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
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/23114507-c191-4471-87ed-af8d3053d54a
Result
Threat name:
AgentTesla, PureLog Stealer
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1390713
Signature
.NET source code contains potential unpacker
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Contains functionality to log keystrokes (.Net Source)
Creates multiple autostart registry keys
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
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
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sample uses string decryption to hide its real strings
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 Putty / WinSCP information (sessions, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Yara detected AgentTesla
Yara detected Costura Assembly Loader
Yara detected PureLog Stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1390713 Sample: Ynstr.exe Startdate: 12/02/2024 Architecture: WINDOWS Score: 100 46 mail.emulines.biz 2->46 48 emulines.biz 2->48 50 api.ipify.org 2->50 52 Found malware configuration 2->52 54 Malicious sample detected (through community Yara rule) 2->54 56 Antivirus / Scanner detection for submitted sample 2->56 58 8 other signatures 2->58 7 Ynstr.exe 1 3 2->7         started        11 Mtwbsyxsy.exe 3 2->11         started        13 sBRfm.exe 3 2->13         started        15 2 other processes 2->15 signatures3 process4 file5 40 C:\Users\user\AppData\Roaming\Mtwbsyxsy.exe, PE32 7->40 dropped 70 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 7->70 72 Creates multiple autostart registry keys 7->72 74 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 7->74 17 Ynstr.exe 16 5 7->17         started        76 Antivirus detection for dropped file 11->76 78 Multi AV Scanner detection for dropped file 11->78 80 Machine Learning detection for dropped file 11->80 22 Mtwbsyxsy.exe 14 4 11->22         started        24 Mtwbsyxsy.exe 11->24         started        26 sBRfm.exe 13->26         started        28 Mtwbsyxsy.exe 15->28         started        30 sBRfm.exe 15->30         started        32 Mtwbsyxsy.exe 15->32         started        34 sBRfm.exe 15->34         started        signatures6 process7 dnsIp8 42 emulines.biz 209.133.204.178, 49705, 49707, 49717 HVC-ASUS United States 17->42 44 api.ipify.org 104.26.13.205, 443, 49704, 49706 CLOUDFLARENETUS United States 17->44 36 C:\Users\user\AppData\Roaming\...\sBRfm.exe, PE32 17->36 dropped 38 C:\Users\user\...\sBRfm.exe:Zone.Identifier, ASCII 17->38 dropped 60 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 17->60 62 Tries to steal Mail credentials (via file / registry access) 17->62 64 Creates multiple autostart registry keys 17->64 66 Hides that the sample has been downloaded from the Internet (zone.identifier) 22->66 68 Tries to harvest and steal browser information (history, passwords, etc) 30->68 file9 signatures10
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731/
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Malicious
First seen:
2024-02-12 11:16:51 UTC
File Type:
PE (.Net Exe)
Extracted files:
3
AV detection:
16 of 24 (66.67%)
Threat level:
  2/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=6kr5gint7oznhprd4vawvavzfwnkopbvopxqmmgqk4cihtwyu4yq._file
Verdict:
malicious
Label(s):
agenttesla_v4
Create hunting rule
agenttesla
Create hunting rule
Result
Malware family:
zgrat
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla family:zgrat keylogger persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/240212-n7fefsed98/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Adds Run key to start application
Looks up external IP address via web service
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
AgentTesla
Detect ZGRat V1
ZGRat
Unpacked files
SH256 hash:
7e8664b1a608d986c37135139c6bbe726554422fe68928886bdc02bdbdeafc4c
MD5 hash:
f8bbb63609a1a38949591fcc95af0fb5
SHA1 hash:
9245cd8988e5b28908e698d9e651edf97b6dc240
Detections:
AgentTesla
Create hunting rule
win_agent_tesla_g2
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_Referenfces_File_Transfer_Clients
Create hunting rule
Agenttesla_type2
Create hunting rule
INDICATOR_SUSPICIOUS_Binary_References_Browsers
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_VaultSchemaGUID
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_References_Messaging_Clients
Create hunting rule
INDICATOR_EXE_Packed_GEN01
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_References_Confidential_Data_Store
Create hunting rule
Link:
https://www.unpac.me/results/bd99aa36-c7cf-4359-9896-c5455936349f/
Parent samples :
f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731
974bc563cc88df7e7133c1cdc06fce86f550ba2ef72ed6702d99d368c2675cc6
760ce8c50b699024ce487ce6ecbfed434637b263088d56fdae65eeeeb3e3cba4
c22a9bb9deef5ea604ec792b755ba95212644f028b52f30629ff297d0dbed6ef
SH256 hash:
19efdf03cb94895935225795f68bb9abfded1869687367013b8b4eee3cc99372
MD5 hash:
4e29f75c0c51b9dec76955f0382d9541
SHA1 hash:
4899aa8e3f57339cbaec8faab777897a76fe1c3a
Link:
https://www.unpac.me/results/bd99aa36-c7cf-4359-9896-c5455936349f/
SH256 hash:
9baf7f5841412356476aa84dbadf7ac36ab2ef7c48aa529660653bc22d421ca9
MD5 hash:
ead729c4a766ad7af824172b1410766d
SHA1 hash:
12ae40eb9fa84190f2cdd9173fb5456826237932
Link:
https://www.unpac.me/results/bd99aa36-c7cf-4359-9896-c5455936349f/
SH256 hash:
721d510d39f18fad5271d48b25ba575fe22d30d53cc4895798f8987b525efd44
MD5 hash:
677235194120853d9bb44e5d59e936b0
SHA1 hash:
014397eae5dcea9876f4488029e9f3013d1b0a53
Link:
https://www.unpac.me/results/bd99aa36-c7cf-4359-9896-c5455936349f/
SH256 hash:
f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731
MD5 hash:
43a00ef10637139c060f1139df3b9cc1
SHA1 hash:
f717df8434925d25e03512c91385bc528576339e
Detections:
Typical_Malware_String_Transforms
Create hunting rule
Link:
https://www.unpac.me/results/bd99aa36-c7cf-4359-9896-c5455936349f/
Malware family:
AgentTesla
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/f2a3d321b3fb/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.95
Link:
https://yomi.yoroi.company/submissions/f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731

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: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_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:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
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: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:Typical_Malware_String_Transforms
Create hunting rule
Author:Florian Roth (Nextron Systems)
Description:Detects typical strings in a reversed or otherwise modified form
Reference:Internal Research
Rule name:Typical_Malware_String_Transforms_RID3473
Create hunting rule
Author:Florian Roth
Description:Detects typical strings in a reversed or otherwise modified form
Reference:Internal Research
Rule name:Windows_Trojan_AgentTesla_ebf431a8
Create hunting rule
Author:Elastic Security

File information

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

Malspam

AgentTesla

Executable exe f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/475825/

Comments