MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6. 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: e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6
SHA3-384 hash: 5f6a5f2f4e7b94614092cfb62a8e8c7af14c8ccde53d8a2cf1cd570e59304c75aaa3c25dd493b05a9b2e199bc9a66560
SHA1 hash: c2b345d2d5ca206dd5e3a562d3201f6f1bfc9080
MD5 hash: 563cc0cdcda7fbfb52cfcfe0a159a5d8
humanhash: crazy-hydrogen-ink-alpha
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'270'460 bytes
First seen:2026-07-12 14:52:09 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (254 x Efimer, 60 x BlankGrabber, 22 x NetSupport)
ssdeep 393216:XGE9DAyvOiF0275HiAXMCHWUjX4cuI3/PGTAI:XD98yW4h75RXMb8XNH/O7
TLSH T1C3E6331866E002FEFAB3023EB9E3D358F8A570190B318AAB47F48BD55D9B1D05D3D616
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 c0b960c0dc797218 (1 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
161
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/4c03efa1-f81b-4c1a-9e24-24d0d261cbcb/
Malware family:
n/a
ID:
1
File name:
exe
Verdict:
No threats detected
Analysis date:
2026-07-12 14:53:48 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/96ee7866-cffc-4958-95f0-e45c669c3526

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/74329/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
97.4%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a53aa33749f0a5acf20eb7a
Tags:
installer 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/6a53aa2af35a67e616bd4f13/reports/89670566-0fe1-4b1f-913d-2bf3aae6cc9c/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-12T12:09:00Z UTC
Last seen:
2026-07-13T20:16:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/5c14030b-5c40-410b-94e3-5feaba7da555
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1941223
Signature
Adds a directory exclusion to Windows Defender
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: 1941223 Sample: default.dat.exe Startdate: 12/07/2026 Architecture: WINDOWS Score: 72 56 Multi AV Scanner detection for submitted file 2->56 58 Joe Sandbox ML detected suspicious sample 2->58 60 Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet 2->60 62 Sigma detected: Suspicious Script Execution From Temp Folder 2->62 8 default.dat.exe 31 2->8         started        12 svchost.exe 1 1 2->12         started        process3 dnsIp4 46 C:\Users\user\AppData\...\unicodedata.pyd, PE32+ 8->46 dropped 48 C:\Users\user\AppData\Local\...\select.pyd, PE32+ 8->48 dropped 50 C:\Users\user\AppData\Local\...\python313.dll, PE32+ 8->50 dropped 52 15 other files (none is malicious) 8->52 dropped 66 Adds a directory exclusion to Windows Defender 8->66 68 Found pyInstaller with non standard icon 8->68 15 default.dat.exe 1 8->15         started        54 127.0.0.1 unknown unknown 12->54 file5 signatures6 process7 signatures8 72 Adds a directory exclusion to Windows Defender 15->72 18 cmd.exe 1 15->18         started        21 cmd.exe 1 15->21         started        23 cmd.exe 1 15->23         started        25 9 other processes 15->25 process9 signatures10 64 Adds a directory exclusion to Windows Defender 18->64 27 powershell.exe 23 18->27         started        30 conhost.exe 18->30         started        32 powershell.exe 23 21->32         started        34 conhost.exe 21->34         started        36 powershell.exe 21 23->36         started        38 conhost.exe 23->38         started        40 powershell.exe 25->40         started        42 powershell.exe 25->42         started        44 16 other processes 25->44 process11 signatures12 70 Loading BitLocker PowerShell Module 36->70
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6
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/563cc0cdcda7fbfb52cfcfe0a159a5d8
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6/
Threat name:
Win64.Dropper.Malgent
Create hunting rule
Status:
Malicious
First seen:
2026-07-12 14:53:44 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
11 of 24 (45.83%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=5gkudqwths7ih3knhzeafiyjdybmobipntvp5uq7e3t5ekq5rg3a._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260712-r8yh7sb16k/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Loads dropped DLL
Command and Scripting Interpreter: PowerShell
Unpacked files
SH256 hash:
e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6
MD5 hash:
563cc0cdcda7fbfb52cfcfe0a159a5d8
SHA1 hash:
c2b345d2d5ca206dd5e3a562d3201f6f1bfc9080
Link:
https://www.unpac.me/results/cfb02bfa-cdc4-4a86-b67a-972fec5d9e97/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/cfb02bfa-cdc4-4a86-b67a-972fec5d9e97/
SH256 hash:
a3632b85e6f1e19e2e9068f2aa060f4817595efbefe8a5aa7087d7bf0cf82064
MD5 hash:
5657550025f336ea0f8ff9839fabbdef
SHA1 hash:
3aa7074f82502d0f6fb2e578c24215a65a11e40f
Link:
https://www.unpac.me/results/cfb02bfa-cdc4-4a86-b67a-972fec5d9e97/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/cfb02bfa-cdc4-4a86-b67a-972fec5d9e97/
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/e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6

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 e99541c2d33cbe83ed4d3e4802a3091e02c7050f6ceafed21f26e7d22a1d89b6

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/74329/

Comments