MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 ac4b99079b1ceb11db593097e421de9d9092765feedc23a3ab8ef912b292c988. 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
Threat unknown
Vendor detections: 9
Maldoc score: 7
| SHA256 hash: | ac4b99079b1ceb11db593097e421de9d9092765feedc23a3ab8ef912b292c988 |
|---|---|
| SHA3-384 hash: | db8b2b722b451915d7f248e0d09a487dd579b82f57ea85bde770df66151536a3e723c8bd3127f091fddc160b528842ba |
| SHA1 hash: | 6f9266a6c0b702cbaa0a3583df5c8cd1357eae35 |
| MD5 hash: | 92dcc47a1a044fc3a2328ec6eef3918b |
| humanhash: | alpha-oklahoma-network-pip |
| File name: | document-47-2637.xls |
| Download: | download sample |
| File size: | 92'165 bytes |
| First seen: | 2021-06-10 21:32:43 UTC |
| Last seen: | 2021-06-10 22:41:04 UTC |
| File type: |  xls |
| MIME type: | application/vnd.ms-excel |
| ssdeep | 1536:Lc2ZSmXWCQnp2c90Hg+j8z3kVfKIDVzoFGUslIB54N+wl8MYBzaVt4J5aukGqu:LXZxXTQ8hHgNQNeF3V4NvuhBzaV+J5a+ |
| TLSH | F19302487663E872E34F81B75032450FE7D83C1DEB56E103BAAA7311AD76D9A11A343E |
| Reporter |  DfirNotes |
| Tags: | xls |
DfirNotes
Malicious Excel file (Excel4 macros., exploits) provided to (likely) victim as email attachment. In automated sandboxes it drops an unidentified sample and loads, executes via LOLBAS ExtExport technique. Found on VirusTotal in email file. Email file:https://www.virustotal.com/gui/file/d68a1498c7b939682c8bf244a9fb5572e72de8afba72b044251bd500434e68c2/detection
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: 7 |
| Application name is Microsoft Excel |
| Office document is in OLE format |
| Office document is in encrypted |
OLE dump
MalwareBazaar was able to identify 3 sections in this file using oledump:
| Section ID | Section size | Section name |
|---|---|---|
| 1 | 4096 bytes | DocumentSummaryInformation |
| 2 | 4096 bytes | SummaryInformation |
| 3 | 81910 bytes | Workbook |
OLE vba
MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:
| Type | Keyword | Description |
|---|---|---|
| AutoExec | Auto_Open | Runs when the Excel Workbook is opened |
| Suspicious | RUN | May run an executable file or a system command |
| Suspicious | Hex Strings | Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
| Suspicious | Base64 Strings | Base64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
Intelligence
File Origin
# of uploads :
2
# of downloads :
175
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
sample.xlsx
Verdict:
Malicious activity
Analysis date:
2021-06-10 21:09:54 UTC
Tags:
macros macros40
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
False
Detection:
n/a
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a window
DNS request
Creating a process with a hidden window
Creating a file
Sending a custom TCP request by exploiting the app vulnerability
Running batch commands by exploiting the app vulnerability
Result
Verdict:
Suspicious
File Type:
Legacy Office File
Result
Verdict:
MALICIOUS
Link:
Details
Excel 4.0 Macro
Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Hidden Macro 4.0
Detection:
malicious
Classification:
expl.evad.bank
Score:
84 / 100
Signature
Checks if browser processes are running
Contains functionality to compare user and computer (likely to detect sandboxes)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Found abnormal large hidden Excel 4.0 Macro sheet
Found Excel 4.0 Macro with suspicious formulas
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Sigma detected: Microsoft Office Product Spawning Windows Shell
Behaviour
Behavior Graph:
Threat name:
Document-Office.Trojan.Heuristic
Status:
Malicious
First seen:
2021-06-03 19:52:08 UTC
AV detection:
7 of 46 (15.22%)
Threat level:
2/5
Result
Malware family:
n/a
Score:
10/10
Tags:
n/a
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Loads dropped DLL
Executes dropped EXE
Process spawned unexpected child process
Malware Config
Dropper Extraction:
https://webhub365.com/xls/black/index/processingSetRequestDownloadPayloader/?servername=excel
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Malspam
xls ac4b99079b1ceb11db593097e421de9d9092765feedc23a3ab8ef912b292c988
(this sample)
c7a7f0123894df280e10bc92344a9e0fda08d2f634e3184eb714e59e068f795c
Dropping
SHA256 c7a7f0123894df280e10bc92344a9e0fda08d2f634e3184eb714e59e068f795c
Delivery method
Distributed via e-mail attachment
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