MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 ef434b46325ef0787bc709ca1e12a5014aefc27f2b7dd4fad73ee1849dfc2a3e. 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
Cosmu
Vendor detections: 12
| SHA256 hash: | ef434b46325ef0787bc709ca1e12a5014aefc27f2b7dd4fad73ee1849dfc2a3e |
|---|---|
| SHA3-384 hash: | 80d380d8914a17abf3b09d80eb053eaa2d4b93a1b3abd07f4a5ed41ede4954f7ed1a646b714215885eba82c8ac5988fe |
| SHA1 hash: | d6086a7d4b7617d9d0dccc6faa8436be59946994 |
| MD5 hash: | 6e275788ddab49f79e1ce8dcf0843689 |
| humanhash: | finch-sweet-hydrogen-wolfram |
| File name: | 7z.exe |
| Download: | download sample |
| Signature | Cosmu |
| File size: | 296'769 bytes |
| First seen: | 2026-06-05 17:52:41 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | b6096454c0b0666c7e487d2e3e0cbf92 (8 x Cosmu) |
| ssdeep | 3072:8myvMnbtGXRvjxCb5NgXDY7uSlkJcUa7kYQTcqW2NdQQGH/UDhSCUc4aqTB3RtM9:GzlKgzelZNQSBQGH/CSpWqTNwNmQ |
| TLSH | T18C54D0003ABECB73D3C246358C7EFA90A6767C6F9B61813BB7987B4F1E712449652205 |
| TrID | 41.0% (.EXE) InstallShield setup (43053/19/16) 29.7% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13) 6.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 6.2% (.EXE) Win64 Executable (generic) (6522/11/2) 4.7% (.EXE) Win16 NE executable (generic) (5038/12/1) |
| Magika | pebin |
| dhash icon | 00b28eabababa600 (6 x Cosmu, 5 x RemcosRAT, 4 x AsyncRAT) |
| Reporter |  qemped |
| Tags: | Cosmu exe |
Intelligence
File Origin
# of uploads :
1
# of downloads :
120
Origin country :
IDVendor Threat Intelligence
No detections
Malware family:
n/a
ID:
1
File name:
_ef434b46325ef0787bc709ca1e12a5014aefc27f2b7dd4fad73ee1849dfc2a3e.exe
Verdict:
No threats detected
Analysis date:
2026-06-05 18:27:35 UTC
Tags:
n/a
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Verdict:
Malicious
Score:
99.9%
Tags:
shellcode dropper worm
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a file
Replacing executable files
Moving a recently created file
Enabling the 'hidden' option for recently created files
Creating a file in the Program Files subdirectories
Moving a file to the Program Files subdirectory
Delayed reading of the file
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-06-03T17:36:00Z UTC
Last seen:
2026-06-03T19:02:00Z UTC
Hits:
~10
Detections:
HEUR:Virus.Win32.Ramnit.gen HEUR:Virus.Win32.Generic
Malware family:
Emotet
Verdict:
Malicious
Score:
100%
Verdict:
Malware
File Type:
PE
Gathering data
Verdict:
Malicious
Threat:
Family.COSMU
Threat name:
Win32.Virus.Emdup
Status:
Malicious
First seen:
2026-06-03 19:43:00 UTC
File Type:
PE (Exe)
Extracted files:
8
AV detection:
33 of 38 (86.84%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
cosmu
Score:
10/10
Tags:
family:cosmu discovery worm
Behaviour
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Enumerates connected drives
Detects Cosmu payload
Family: Cosmu
Unpacked files
SH256 hash:
ef434b46325ef0787bc709ca1e12a5014aefc27f2b7dd4fad73ee1849dfc2a3e
MD5 hash:
6e275788ddab49f79e1ce8dcf0843689
SHA1 hash:
d6086a7d4b7617d9d0dccc6faa8436be59946994
Detections:
triage_ramnit_worm
Please note that we are no longer able to provide a coverage score for Virus Total.
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 |
|---|---|
| Reference: | https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara |
| Rule name: | golang_bin_JCorn_CSC846 |
|---|---|
| Author: | Justin Cornwell |
| Description: | CSC-846 Golang detection ruleset |
| Rule name: | TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE |
|---|---|
| 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: | VECT_Ransomware |
|---|---|
| Author: | Mustafa Bakhit |
| Description: | Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments. |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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