Office (OLE) / .XLSX malware analysis — malicious · 31284b329d5267ce

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 1b5c4b7f05de98d727cfd79c9494b4db SHA-1: c0f9ad98a6051a0780f97941a729e713746bff8f SHA-256: 31284b329d5267ce49ed7b8e3e97568ad15aa83923648a69bb70c539dbc72c43

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is a macro-enabled Excel document containing a Workbook_Open macro that executes a command. This command appears to download and execute a VBScript payload from a remote URL, specifically 'http://midnighsilverbircraft.com/store/wBjNOUwc/PA7_22_2009/BI710N4cQA6R3/' or 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQA6R3/', and saves it as 'c:\programdata\oue4hjld.vbs'. It also creates a batch file 'c:\programdata\bhnasleil.bat'. The VBA script's obfuscated nature and the presence of multiple download URLs suggest a downloader functionality aiming to retrieve and execute further malicious content.

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` `a94675afc7fa0bb2abf933c2bbb71c89da68c84033ff64e3b76f861fb1f5b8f4`	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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