MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00. 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


Efimer


Vendor detections: 11


Intelligence 11 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00
SHA3-384 hash: 065541464e83c3885390fc0d8262f897577fa21a35cbaee59d71f47ac2760986cae616389f52a49e60830af5a4eb025f
SHA1 hash: 48d67c6148914c0bc853a3c3a87631ae3fd68b32
MD5 hash: c5f22d73858f05529aa1cd2818bd9e2f
humanhash: fillet-carolina-princess-saturn
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'309'932 bytes
First seen:2026-07-20 07:52:10 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (408 x Efimer, 60 x BlankGrabber, 22 x SalatStealer)
ssdeep 393216:uCI5BcSmXCYxSctWPUWYbXMCHWUjXzcuI3/PGTAI:uCqB9mSYpUwXMb8XwH/O7
TLSH T104E63358AAD021FEE5739138DEF209A6E0B4B05507B2C5D75B6847E4AE172F24C3EB13
TrID 37.0% (.EXE) Win64 Executable (generic) (6522/11/2)
28.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
11.5% (.EXE) OS/2 Executable (generic) (2029/13)
11.3% (.EXE) Generic Win/DOS Executable (2002/3)
11.3% (.EXE) DOS Executable (generic) (2000/1)
Magika pebin
dhash icon 71f0f0e8e8f0f070 (3 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


Avatar
iamaachum
https://tuasesoriadigital.es/default.dat

Intelligence

File Origin
# of uploads :
1
# of downloads :
146
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/686dda98-7a5c-48d4-bf7d-a9e569e555cc/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/75270/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a5dd3c6bcffb2c48cb79d18
Tags:
installer vmdetect shell sage
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file in the %temp% subdirectories
Restart of the analyzed sample
Creating a window
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
anti-debug expand installer-heuristic lolbin masquerade microsoft_visual_cc overlay packed packed packed pyinstaller reconnaissance
Link:
https://www.filescan.io/uploads/6a5dd3bb33d19efd891e6842/reports/58244660-bedc-42e1-bc0e-76e3d2b82160/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-20T06:26:00Z UTC
Last seen:
2026-07-20T09:58:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/1d371404-24af-4f28-ba2e-453cc4aff2c0
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
76 / 100
Link:
https://www.joesandbox.com/analysis/1945082
Signature
Adds a directory exclusion to Windows Defender
Contains functionality to infect the boot sector
Found pyInstaller with non standard icon
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Multi AV Scanner detection for submitted file
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Suspicious Script Execution From Temp Folder
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1945082 Sample: default.dat.exe Startdate: 20/07/2026 Architecture: WINDOWS Score: 76 51 Multi AV Scanner detection for submitted file 2->51 53 Joe Sandbox ML detected suspicious sample 2->53 55 Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet 2->55 57 Sigma detected: Suspicious Script Execution From Temp Folder 2->57 8 default.dat.exe 31 2->8         started        process3 file4 43 C:\Users\user\AppData\...\unicodedata.pyd, PE32+ 8->43 dropped 45 C:\Users\user\AppData\Local\...\select.pyd, PE32+ 8->45 dropped 47 C:\Users\user\AppData\Local\...\python313.dll, PE32+ 8->47 dropped 49 16 other files (none is malicious) 8->49 dropped 61 Contains functionality to infect the boot sector 8->61 63 Adds a directory exclusion to Windows Defender 8->63 65 Found pyInstaller with non standard icon 8->65 12 default.dat.exe 1 8->12         started        signatures5 process6 signatures7 67 Adds a directory exclusion to Windows Defender 12->67 15 cmd.exe 1 12->15         started        18 cmd.exe 1 12->18         started        20 cmd.exe 1 12->20         started        22 10 other processes 12->22 process8 signatures9 69 Adds a directory exclusion to Windows Defender 15->69 24 powershell.exe 23 15->24         started        27 conhost.exe 15->27         started        29 powershell.exe 23 18->29         started        31 conhost.exe 18->31         started        33 powershell.exe 23 20->33         started        35 conhost.exe 20->35         started        37 powershell.exe 22->37         started        39 powershell.exe 22->39         started        41 16 other processes 22->41 process10 signatures11 59 Loading BitLocker PowerShell Module 33->59
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable PDB Path PE (Portable Executable) PE File Layout Win 64 Exe x64
Link:
https://app.malva.re/file/c5f22d73858f05529aa1cd2818bd9e2f
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00/
Threat name:
Win64.Trojan.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-20 07:53:45 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
8 of 24 (33.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=fpft3h2kyd4hjkr3xzbqmat7g2kqa22qq7zmlllnahbsdxcp3uaa._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260720-jqq3eaax3q/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Executes a command shell one-liner
Loads dropped DLL
Command and Scripting Interpreter: PowerShell
Unpacked files
SH256 hash:
2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00
MD5 hash:
c5f22d73858f05529aa1cd2818bd9e2f
SHA1 hash:
48d67c6148914c0bc853a3c3a87631ae3fd68b32
Link:
https://www.unpac.me/results/fc901424-920e-4ea5-931d-b26fe5fcbb6c/
SH256 hash:
3360dcb0191fb713d4b90bc4bfaed90bb1d9995cc5838bd0d6d60254cdd7e791
MD5 hash:
a7724deab40d3f79595ba05b56f56973
SHA1 hash:
d0bf4e6ef42587adb620eedd193acdbf4f5b4c8e
Link:
https://www.unpac.me/results/fc901424-920e-4ea5-931d-b26fe5fcbb6c/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/fc901424-920e-4ea5-931d-b26fe5fcbb6c/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/fc901424-920e-4ea5-931d-b26fe5fcbb6c/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00

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:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerException__SetConsoleCtrl
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Detect_PyInstaller
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects PyInstaller compiled executables across platforms
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:PyInstaller
Create hunting rule
Author:@bartblaze
Description:Identifies executable converted using PyInstaller. This rule by itself does NOT necessarily mean the detected file is malicious.
Rule name:TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:https://cyfare.net/
Rule name:upxHook
Create hunting rule
Author:@r3dbU7z
Description:Detect artifacts from 'upxHook' - modification of UPX packer
Reference:https://bazaar.abuse.ch/sample/6352be8aa5d8063673aa428c3807228c40505004320232a23d99ebd9ef48478a/

File information

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

Web download

Efimer

Executable exe 2bcb3d9f4ac0f874aa3bbe4306027f3695006b5087f2c5ad6d01c321dc4fdd00

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/75270/

Comments