MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41. 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: 8


Intelligence 8 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41
SHA3-384 hash: b2c5007dc21f5120620e5a34f08068c229a97dc798642f5ba56e4e1c55d498fcba1c16a818710f3b0f8e46f1a6b6be9f
SHA1 hash: 91b0265d8ea80a4d53d0b5efe629d8f09e941ab9
MD5 hash: d426de7672d8187fc17473a136a58b2f
humanhash: freddie-massachusetts-stairway-hot
File name:composer.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'064'287 bytes
First seen:2026-08-10 16:52:28 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (712 x Efimer, 60 x BlankGrabber, 23 x SalatStealer)
ssdeep 393216:O8Q2NSVIJvGOVW9gXMCHWUjCcuI3/PGTAI:O8Q2NoIGOVW9gXMb8/H/O7
TLSH T13FE6331C79D0018FF823123EFD922161A6A5B8725771CA9B8BFC82767E172F0593E617
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 30f8fc9ccce4f070 (3 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


Avatar
iamaachum
https://hasansunnah.xyz/composer.dat

Intelligence

File Origin
# of uploads :
1
# of downloads :
148
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/e3071c75-bf32-4429-b52b-4522ce98d7ae/
Malware family:
n/a
ID:
1
File name:
https://hasansunnah.xyz/composer.dat
Verdict:
No threats detected
Analysis date:
2026-08-10 16:35:27 UTC
Tags:
loader arch-scr
Link:
https://app.any.run/tasks/4f5d1f07-fb78-406d-bb91-214c43b8ec41

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Gathering data
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
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/6a7a02104b151d4b6ef2c30e/reports/4a6510d5-e930-4234-9611-ea4a73adf63d/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_70%
Link:
https://www.hybrid-analysis.com/sample/fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
80 / 100
Link:
https://www.joesandbox.com/analysis/1955266
Signature
Adds a directory exclusion to Windows Defender
Antivirus / Scanner detection for submitted sample
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: 1955266 Sample: composer.dat.exe Startdate: 10/08/2026 Architecture: WINDOWS Score: 80 51 Antivirus / Scanner detection for submitted sample 2->51 53 Multi AV Scanner detection for submitted file 2->53 55 Joe Sandbox ML detected suspicious sample 2->55 57 2 other signatures 2->57 8 composer.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 Adds a directory exclusion to Windows Defender 8->61 63 Found pyInstaller with non standard icon 8->63 12 composer.dat.exe 2 8->12         started        signatures5 process6 signatures7 65 Adds a directory exclusion to Windows Defender 12->65 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 67 Adds a directory exclusion to Windows Defender 15->67 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 21 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 24->59
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41/
Gathering data
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=73bbybghzgj7nvjxto3lixc674mgtpfazs5u5bzvzaychntzhzaq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260810-vd8mgadl5y/
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:
fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41
MD5 hash:
d426de7672d8187fc17473a136a58b2f
SHA1 hash:
91b0265d8ea80a4d53d0b5efe629d8f09e941ab9
Link:
https://www.unpac.me/results/fdb2acd5-728d-4c3b-9fe5-ae95803ec30a/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/fdb2acd5-728d-4c3b-9fe5-ae95803ec30a/
SH256 hash:
84e7c026f11540db16af09fccbf4c8c6f0e56adbf7c2ebacdd076b8f9b91bab9
MD5 hash:
755ba178edbce349a37765542de9a2b3
SHA1 hash:
872d6442f255a44c20a85de4b26ca12c6d793928
Link:
https://www.unpac.me/results/fdb2acd5-728d-4c3b-9fe5-ae95803ec30a/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/fdb2acd5-728d-4c3b-9fe5-ae95803ec30a/
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/fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41

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 fec21c04c7c993f6d5379bb6b45c5eff1869bca0ccbb4e8735c83023b6793e41

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/80153/

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