Emotet Office (OLE) / .XLSX malware analysis — malicious · 2a4c8190ec9881dd

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 19a5737f31f2a41cea7b503bf706c94d SHA-1: 3097b412d512add3c3d8f522ce629a35b33ebf28 SHA-256: 2a4c8190ec9881dd72db657de33189118c3fe837fed645a5e3ba314fd3a4f0eb

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros that are automatically executed upon opening the workbook, as indicated by the Workbook_Open event firing. The script references Wscript.Shell and uses CreateObject, suggesting it's designed to execute commands or scripts. The DOC BODY contains a batch script that appears to download and execute a VBScript payload from multiple URLs. The ClamAV detection as 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0' strongly suggests an Emotet family infection. The script's intent is to download and execute a second-stage payload from the embedded URLs.

Heuristics 7

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13985 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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