Emotet Office (OLE) / .XLSX malware analysis — malicious · d5c73c6d5fcd3f33

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: febcdfc3d378b623504ff4b8e9c1afa6 SHA-1: 177ded222dc3751a98e6bd9a7fb5d9c022480464 SHA-256: d5c73c6d5fcd3f3389c97cc26fc1739b94c09bda08238dd87dc1276a57abc557

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls strongly indicate a malicious downloader. The VBA script contains obfuscated commands that reconstruct URLs for downloading payloads, specifically mentioning 'http://temp.com/NAT_22_2009/BI710N4cQA6R3/' and 'https://redington.karmart'. It also attempts to write batch and VBScript files to 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat', likely to execute the downloaded payload and establish persistence.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `522689c202398bd9aa345d4389553d649763ec766847181cfc6af38bf3f28cf5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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