MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e. 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: 10


Intelligence 10 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e
SHA3-384 hash: 5ccd44ca0f738a0ad57636162641c44d7a3bbdbdf6c53a46db88d0bc5d6ee67864bb355a85ae9733b8d1969f9e304dc9
SHA1 hash: a38457696be516b3df94d5447b18efca897bedb1
MD5 hash: 3534bb2163564f8326a7af28958fb6d2
humanhash: avocado-equal-lamp-hot
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'266'106 bytes
First seen:2026-07-22 10:52:08 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (451 x Efimer, 60 x BlankGrabber, 22 x SalatStealer)
ssdeep 393216:APFf1eN/9k50FkB6JWci8Z2ZcGYXMCHWUjXQcuI3/PGTAI:oF9QVA0GBoWci62VYXMb8XFH/O7
TLSH T185E6331D75D406EAFDB32238CCA20645E571746A1771CAAF575AC2E21C272B04E3EB3B
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 30f0d4d8c8ecf030 (2 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
178
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/87a4e086-2ac4-4ba3-ad6c-3827a008834b/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/75670/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file in the %temp% subdirectories
Restart of the analyzed sample
Creating a window
Launching a service
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/6a60a0f4287bc2d1e0acd085/reports/767c9e29-bbad-49a3-a52a-d6593af6df10/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-22T08:53:00Z UTC
Last seen:
2026-07-22T11:49:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/84a1cd1b-62e2-474d-bf9d-6ce3c4a3c022
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
76 / 100
Link:
https://www.joesandbox.com/analysis/1946471
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: 1946471 Sample: default.dat.exe Startdate: 22/07/2026 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 15 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 9 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:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e
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/3534bb2163564f8326a7af28958fb6d2
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e/
Threat name:
Win64.Malware.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-22 10:53:48 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
9 of 36 (25.00%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=pi5b5kmn26tqlz7scpium2xokxabbvayxk4ktqlu7kpumbandypa._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260722-mypfbszwav/
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:
7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e
MD5 hash:
3534bb2163564f8326a7af28958fb6d2
SHA1 hash:
a38457696be516b3df94d5447b18efca897bedb1
Link:
https://www.unpac.me/results/aa1d48dd-b420-4834-a249-34ef6d87fe02/
SH256 hash:
35323164f9d74cfe39a6a810e5b80a22a8ef29377dba5ed30b0329980487e607
MD5 hash:
a935f5ebf4d0b569c803760254ca29c2
SHA1 hash:
cd669ad1f53361a7f24ff6ecf12d22b09e23375f
Link:
https://www.unpac.me/results/aa1d48dd-b420-4834-a249-34ef6d87fe02/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/aa1d48dd-b420-4834-a249-34ef6d87fe02/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/aa1d48dd-b420-4834-a249-34ef6d87fe02/
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/7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e

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 7a3a1ea98dd7a705e7f213d1466aee55c010d418bab8a9c174fa9f46040d1e1e

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/75670/

Comments