Office (OLE) / .XLSX malware analysis — malicious · 3f3db971f1d2721a

MALICIOUS

Office (OLE) / .XLSX

2.52 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: baadccb9fec9f54c22eba25a15d0b484 SHA-1: cedbff948ac1744587f33d18415f018172f984c4 SHA-256: 3f3db971f1d2721ac273e60fb9b0e172bb635f8f5e7889eaf9fc59d61edd5ddc

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1490 Inhibit System Recovery

This XLSX file contains a Workbook_Open macro, which is a common technique for executing malicious code upon opening the document. The macro uses a CreateObject call to instantiate a FileSystemObject and then attempts to delete files using the dx1x0xnx subroutine. The script is heavily obfuscated, making it difficult to determine the exact files targeted or if further malicious actions are intended. The primary observed malicious behavior is file deletion.

Heuristics 6

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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3e2fe1d7ad810bfc1eca966956242b5f30bc118b0fa6163194f14a903a925ab9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	21395 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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