MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 91aa050536d834947709776af40c2fde49471d28231de50df0d324cd55101df4. 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


ZLoader


Vendor detections: 6


Maldoc score: 11


Intelligence 6 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 91aa050536d834947709776af40c2fde49471d28231de50df0d324cd55101df4
SHA3-384 hash: 9f76ccdfd0230d94bd18631aab60906174e1eb8bd5ff8407190d190c9db229e582bf92ae90c32e0de9b31bd98e280feb
SHA1 hash: bc14ed98817dc86155a5f68481fe17a9180db120
MD5 hash: 10472cea3eddfefa8471639eacdf5573
humanhash: lake-jig-victor-iowa
File name:dep_det_3444608.docm
Download: download sample
Signature ZLoader
Create hunting rule
File size:72'365 bytes
First seen:2021-01-20 17:07:50 UTC
Last seen:Never
File type:Word file docm
MIME type:application/vnd.openxmlformats-officedocument.wordprocessingml.document
ssdeep 1536:2EBVKfxjJoxQ4J2oLKjYR8Je3HJcupfAM:zBVKjJOJ2wYYaUHNfN
TLSH BC630276F8017075F8F287FFC1A433F8D09921C85763A6C26F419B2CD5A460BA63B658
Reporter ffforward
Tags:docm ZLoader

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 11
OLE dump

MalwareBazaar was able to identify 30 sections in this file using oledump:

Section IDSection sizeSection name
A1695 bytesPROJECT
A2161 bytesPROJECTwm
A397 bytesUserForm1/CompObj
A4286 bytesUserForm1/VBFrame
A5226 bytesUserForm1/f
A6292 bytesUserForm1/o
A797 bytesUserForm2/CompObj
A8287 bytesUserForm2/VBFrame
A91150 bytesUserForm2/f
A101592 bytesUserForm2/o
A1197 bytesUserForm3/CompObj
A12292 bytesUserForm3/VBFrame
A1394 bytesUserForm3/f
A1456 bytesUserForm3/o
A1597 bytesUserForm4/CompObj
A16292 bytesUserForm4/VBFrame
A1794 bytesUserForm4/f
A1856 bytesUserForm4/o
A199445 bytesVBA/ThisDocument
A201160 bytesVBA/UserForm1
A213253 bytesVBA/UserForm2
A221756 bytesVBA/UserForm3
A231451 bytesVBA/UserForm4
A247047 bytesVBA/_VBA_PROJECT
A251689 bytesVBA/__SRP_0
A26172 bytesVBA/__SRP_1
A27550 bytesVBA/__SRP_2
A28295 bytesVBA/__SRP_3
A29891 bytesVBA/dir
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecDocument_CloseRuns when the Word document is closed
SuspiciousOpenMay open a file
SuspiciousRunMay run an executable file or a system command
SuspiciousCreateObjectMay create an OLE object
SuspiciousCallByNameMay attempt to obfuscate malicious function calls
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
1
# of downloads :
256
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
dep_det_3444608.docm
Verdict:
Suspicious activity
Analysis date:
2021-01-20 17:09:05 UTC
Tags:
macros macros-on-close generated-doc
Link:
https://app.any.run/tasks/1c675e22-9966-42e2-92cf-de6fe5176b30

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/vnd.ms-word.document.macroEnabled.12
Has a screenshot:
False
Contains macros:
True
Detection(s):
TwinWave.EvilDoc.CROStringBuilderHidingPlacesPapaDontTakeNoMess.20200916.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Result
Verdict:
MALICIOUS
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Suspicious Document Variables
Detected a macro that references a suspicious number of tersely named variables.
Document With Minimal Content
Document contains less than 1 kilobyte of semantic information.
Result
Threat name:
Unknown
Detection:
malicious
Classification:
troj.expl
Score:
68 / 100
Link:
https://www.joesandbox.com/analysis/586486
Signature
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA macro which might access itself as a file (possible anti-VM)
Document contains an embedded VBA macro with suspicious strings
Document contains an embedded VBA with functions possibly related to ADO stream file operations
Machine Learning detection for sample
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Behaviour
Behavior Graph:
Download SVG
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/91aa050536d834947709776af40c2fde49471d28231de50df0d324cd55101df4/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=sgvakbjw3a2ji5yjo5vpidbp3zeuohjiemo6kdpq2msm2viqdx2a._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
macro ransomware
Link:
https://tria.ge/reports/210120-n6ta2vxlzj/
Behaviour
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Enumerates physical storage devices
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/91aa050536d834947709776af40c2fde49471d28231de50df0d324cd55101df4

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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

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

Malspam

ZLoader

Word file docm 91aa050536d834947709776af40c2fde49471d28231de50df0d324cd55101df4

(this sample)

anyrun
any.run
https://app.any.run/tasks/0f6c7897-ce16-4614-a779-e03b1029aa57
  
Delivery method
Distributed via e-mail attachment

Comments