MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21. 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


MassLogger


Vendor detections: 15


Intelligence 15 IOCs YARA 6 File information Comments
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SHA256 hash: f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21
SHA3-384 hash: b5aa5d8ab09484815c515d8d1c22710325b5097045a8ef3718721b66de793623e034b7113428dcfca90c610194803d85
SHA1 hash: 659b10ac55695ab78184d00f40821318f2581554
MD5 hash: 1d227a446233201b40495934d251a673
humanhash: venus-india-mango-leopard
File name:Att-01-043025.pdf.exe
Download: download sample
Signature MassLogger
Create hunting rule
File size:581'128 bytes
First seen:2025-04-30 07:54:39 UTC
Last seen:2025-05-06 08:56:38 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'657 x AgentTesla, 19'469 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 12288:++k5N0qTG1ObI3ysDxbArZg2GbACNKCJkgonukD5hkR:FUfTkO6Ar62Grkgon58
TLSH T19DC4F1987659D503CAA66BB00B32F678177DAEDDA910C3974ED86DEFB8E6F400C05243
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
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)
Magika pebin
dhash icon b170e88e8e8c6860 (6 x Formbook, 5 x MassLogger, 5 x SnakeKeylogger)
Reporter adrian__luca
Tags:exe MassLogger

Intelligence

File Origin
# of uploads :
3
# of downloads :
386
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Att-01-043025.pdf.exe
Verdict:
Malicious activity
Analysis date:
2025-04-30 08:40:47 UTC
Tags:
snake keylogger evasion stealer
Link:
https://app.any.run/tasks/fe74268b-3837-45c0-b506-60c1384549ec

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/5117/
Detection(s):
Win.Packed.Formbook-10021419-0
Create hunting rule

Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6811dbbfc8b2e86d0ac50a1d
Tags:
underscore virus spawn msil
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
DNS request
Connection attempt
Sending an HTTP GET request
Sending a custom TCP request
Reading critical registry keys
Adding an exclusion to Microsoft Defender
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
expired-cert invalid-signature masquerade obfuscated packed packed packer_detected signed vbnet
Link:
https://www.filescan.io/uploads/6811d76146fe05453caabc32/reports/09307b1c-79f9-40e2-b48f-636ece4f4b15/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21
Malware family:
Snake Keylogger
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/6c4c4511-37d2-4e19-acc5-603888eaaad3
Result
Threat name:
MSIL Logger, MassLogger RAT
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1677917
Signature
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
Adds a directory exclusion to Windows Defender
Contains functionality to log keystrokes (.Net Source)
Found malware configuration
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Suspicious Double Extension File Execution
Tries to detect the country of the analysis system (by using the IP)
Tries to harvest and steal browser information (history, 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 AntiVM3
Yara detected MassLogger RAT
Yara detected MSIL Logger
Yara detected Telegram RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1677917 Sample: Att-01-043025.pdf.exe Startdate: 30/04/2025 Architecture: WINDOWS Score: 100 27 reallyfreegeoip.org 2->27 29 checkip.dyndns.org 2->29 31 checkip.dyndns.com 2->31 45 Found malware configuration 2->45 47 Malicious sample detected (through community Yara rule) 2->47 49 Multi AV Scanner detection for submitted file 2->49 53 12 other signatures 2->53 8 Att-01-043025.pdf.exe 4 2->8         started        12 svchost.exe 1 1 2->12         started        signatures3 51 Tries to detect the country of the analysis system (by using the IP) 27->51 process4 dnsIp5 25 C:\Users\user\...\Att-01-043025.pdf.exe.log, ASCII 8->25 dropped 55 Adds a directory exclusion to Windows Defender 8->55 57 Injects a PE file into a foreign processes 8->57 15 Att-01-043025.pdf.exe 15 2 8->15         started        19 powershell.exe 23 8->19         started        33 127.0.0.1 unknown unknown 12->33 file6 signatures7 process8 dnsIp9 35 checkip.dyndns.com 132.226.247.73, 49695, 80 UTMEMUS United States 15->35 37 reallyfreegeoip.org 104.21.64.1, 443, 49696, 49697 CLOUDFLARENETUS United States 15->37 39 Tries to steal Mail credentials (via file / registry access) 15->39 41 Tries to harvest and steal browser information (history, passwords, etc) 15->41 43 Loading BitLocker PowerShell Module 19->43 21 WmiPrvSE.exe 19->21         started        23 conhost.exe 19->23         started        signatures10 process11
Score:
94%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21/
Threat name:
ByteCode-MSIL.Trojan.Taskun
Create hunting rule
Status:
Malicious
First seen:
2025-04-30 03:14:59 UTC
File Type:
PE (.Net Exe)
Extracted files:
8
AV detection:
25 of 38 (65.79%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=6qxvs756subd7cne5jstm32a3dctgiisfloqnnuie3p3ppt3liqq._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
novastealer
Create hunting rule
Similar samples:
error
MassLogger
Result
Malware family:
n/a
Score:
  8/10
Tags:
collection discovery execution spyware stealer
Link:
https://tria.ge/reports/250430-jr7fsafr3y/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
outlook_office_path
outlook_win_path
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Looks up external IP address via web service
Checks computer location settings
Reads user/profile data of local email clients
Reads user/profile data of web browsers
Command and Scripting Interpreter: PowerShell
Verdict:
Malicious
Tags:
Win.Packed.Formbook-10021419-0 404keylogger
YARA:
n/a
Link:
https://app.threat.zone/submission/681bdbb4-6147-4040-9b84-9c0d306fa4c3
Unpacked files
SH256 hash:
f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21
MD5 hash:
1d227a446233201b40495934d251a673
SHA1 hash:
659b10ac55695ab78184d00f40821318f2581554
Link:
https://www.unpac.me/results/85169926-6a13-4d1b-9d41-bc6935b5ee74/
SH256 hash:
ad553f0a2eb20c96fdbae06ce36176cbcc36f080dadbd2320dfe30dc458c3a78
MD5 hash:
98329b810055c3c794de2e5b239f5502
SHA1 hash:
09742e5dd2555d2841e4cff9b5b5e89323a16d22
Detections:
win_404keylogger_g1
Create hunting rule
win_masslogger_w0
Create hunting rule
MAL_Envrial_Jan18_1
Create hunting rule
INDICATOR_SUSPICIOUS_Binary_References_Browsers
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_TelegramChatBot
Create hunting rule
Link:
https://www.unpac.me/results/85169926-6a13-4d1b-9d41-bc6935b5ee74/
Parent samples :
f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21
cc389f14214ee60e2452404c1067ea8d096a88ee21bda9fac9931688543b8721
SH256 hash:
060580490c45ed7afdb190e104fb1cb844e68711d256b5923dfb31dfa34fc43c
MD5 hash:
ae6e8295683f6e238a2db62739798a03
SHA1 hash:
0d915ad5a4ad0bbe8b06739e378a1318184459fa
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/85169926-6a13-4d1b-9d41-bc6935b5ee74/
SH256 hash:
e34a8b2d8fbae0e1834eca6ba3bf488c032c41a86f7aa6656b237ff9533c327b
MD5 hash:
27bb3b9e1d0195707da8d2ddf9fe670b
SHA1 hash:
a3486b8d955ab0199e3ceebd37406c633d6de4cf
Link:
https://www.unpac.me/results/85169926-6a13-4d1b-9d41-bc6935b5ee74/
Malware family:
PrivateLogger
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/f42f597fbe95/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
Link:
https://yomi.yoroi.company/submissions/f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21

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:INDICATOR_KB_CERT_7c1118cbbadc95da3752c46e47a27438
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Malspam

MassLogger

Executable exe f42f597fbe95023f89a4ea65366f40d8c53321122add06b68826dfb7be7b5a21

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/5117/

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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