MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb. 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


ResolverRAT


Vendor detections: 11


Intelligence 11 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb
SHA3-384 hash: 27989ffe6bafc832e414edb3415aed479c28c7eb0ad373d58ef89fff3862bfa602051e974374ba2571936155f8d16870
SHA1 hash: 24462b1f2efdc28e4bc624bfcdc270a2127cf8bb
MD5 hash: 51b1dabb4f257ba5e9b936286dcfc63f
humanhash: cat-uranus-indigo-hydrogen
File name:Yeovlfkjp.exe
Download: download sample
Signature ResolverRAT
Create hunting rule
File size:7'002'112 bytes
First seen:2025-05-28 13:42:13 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 98304:F848jTaiMcfbtTl2yxTSe2FfUF91UN8vMIwYk0kE:FITPMcfb1l2sf2Ffc1UN8C9
TLSH T13766BE8393E50D43C4150B7DA5478A73D7B2E908C3A7C393274A9F3FEE4A3A85D45A86
TrID 67.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
9.7% (.EXE) Win64 Executable (generic) (10522/11/4)
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)
Magika pebin
Reporter burger
Tags:exe ResolverRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
392
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Yeovlfkjp.exe
Verdict:
Malicious activity
Analysis date:
2025-05-28 13:48:55 UTC
Tags:
purecrypter netreactor auto-reg arch-exec
Link:
https://app.any.run/tasks/16fc7db4-bede-4f23-bc10-b942cb7f593a

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/6026/
Verdict:
Clean
Score:
84.2%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68371446668438e362e7b064
Tags:
n/a
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a file
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
base64 obfuscated obfuscated packed packed smartassembly smart_assembly
Link:
https://www.filescan.io/uploads/683712c0171e01f9592f88dd/reports/01562df3-1cfd-4a52-846d-18534df24434/overview
Verdict:
Malicious
Labled as:
Trojan.Mardom.PN.Generic
Link:
https://www.hybrid-analysis.com/sample/b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/5a730ab2-f964-47b9-aefa-2c66076bd496
Result
Threat name:
ResolverRAT
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1700739
Signature
.NET source code contains potential unpacker
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Drops PE files with benign system names
Encrypted powershell cmdline option found
Found Tor onion address
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Files With System Process Name In Unsuspected Locations
Sigma detected: Invoke-Obfuscation CLIP+ Launcher
Sigma detected: Invoke-Obfuscation VAR+ Launcher
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: System File Execution Location Anomaly
Sigma detected: Tor Client/Browser Execution
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses ipconfig to lookup or modify the Windows network settings
Uses threadpools to delay analysis
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected Costura Assembly Loader
Yara detected ResolverRAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1700739 Sample: Yeovlfkjp.exe Startdate: 28/05/2025 Architecture: WINDOWS Score: 100 82 archive.torproject.org 2->82 84 archive-01.torproject.org 2->84 98 Multi AV Scanner detection for submitted file 2->98 100 Yara detected ResolverRAT 2->100 102 Yara detected AntiVM3 2->102 104 9 other signatures 2->104 9 Yeovlfkjp.exe 1 5 2->9         started        13 svchost.exe 3 2->13         started        15 svchost.exe 2->15         started        signatures3 process4 file5 76 C:\Users\user\AppData\Roaming\svchost.exe, PE32 9->76 dropped 78 C:\Users\user\...\svchost.exe:Zone.Identifier, ASCII 9->78 dropped 116 Encrypted powershell cmdline option found 9->116 118 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 9->118 120 Writes to foreign memory regions 9->120 128 2 other signatures 9->128 17 InstallUtil.exe 15 19 9->17         started        22 powershell.exe 23 9->22         started        24 cmd.exe 1 9->24         started        26 cmd.exe 1 9->26         started        122 Multi AV Scanner detection for dropped file 13->122 124 Injects a PE file into a foreign processes 13->124 126 Uses threadpools to delay analysis 13->126 28 cmd.exe 13->28         started        30 cmd.exe 13->30         started        32 InstallUtil.exe 13->32         started        34 cmd.exe 15->34         started        36 2 other processes 15->36 signatures6 process7 dnsIp8 80 archive-01.torproject.org 159.69.63.226, 443, 49691 HETZNER-ASDE Germany 17->80 68 C:\Users\user\AppData\Local\Temp\...\tor.exe, PE32 17->68 dropped 70 C:\Users\user\AppData\...\tor-gencert.exe, PE32 17->70 dropped 72 C:\Users\user\...\webtunnel-client.exe, PE32 17->72 dropped 74 3 other files (none is malicious) 17->74 dropped 106 Found Tor onion address 17->106 108 Uses threadpools to delay analysis 17->108 38 tor.exe 17->38         started        42 9 other processes 17->42 110 Loading BitLocker PowerShell Module 22->110 44 2 other processes 22->44 112 Uses ipconfig to lookup or modify the Windows network settings 24->112 46 2 other processes 24->46 48 2 other processes 26->48 50 2 other processes 28->50 52 2 other processes 30->52 54 2 other processes 34->54 56 2 other processes 36->56 file9 signatures10 process11 dnsIp12 86 185.243.218.61, 49700, 9003 TERRAHOSTNO Norway 38->86 88 45.141.215.200, 9100 SPECTRAIPSpectraIPBVNL Netherlands 38->88 94 2 other IPs or domains 38->94 114 Found Tor onion address 38->114 58 conhost.exe 38->58         started        90 62.72.82.232, 9001 VERSATELDE Germany 42->90 92 142.132.204.165, 4080, 49726 UNIVERSITYOFWINNIPEG-ASNCA Canada 42->92 96 9 other IPs or domains 42->96 60 conhost.exe 42->60         started        62 conhost.exe 42->62         started        64 conhost.exe 42->64         started        66 6 other processes 42->66 signatures13 process14
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb/
Threat name:
ByteCode-MSIL.Trojan.DarkCloud
Create hunting rule
Status:
Malicious
First seen:
2025-05-28 13:42:29 UTC
File Type:
PE (.Net Exe)
Extracted files:
1
AV detection:
21 of 24 (87.50%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wk4z4mrznharlxanfei2xntrnwmjkmwtnjbwrsin43odaj63ec5q._file
Result
Malware family:
n/a
Score:
  7/10
Tags:
discovery persistence
Link:
https://tria.ge/reports/250528-qzs2pawwgs/
Behaviour
Gathers network information
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Adds Run key to start application
Checks computer location settings
Executes dropped EXE
Verdict:
Malicious
Tags:
Win.Packed.Msilheracles-10017859-0
YARA:
n/a
Link:
https://app.threat.zone/submission/ab9dd741-7967-4bac-bd63-39dcfc38e5ad
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.93
Link:
https://yomi.yoroi.company/submissions/b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb

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_EXE_Packed_SmartAssembly
Create hunting rule
Author:ditekSHen
Description:Detects executables packed with SmartAssembly
Rule name:NET
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

File information

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

Web download

ResolverRAT

Executable exe b2b99e323969c115dc0d2911abb6716d989532d36a4368c90de6dc3027db20bb

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3554629/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/6026/

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 (GUARD_CF)high

Comments