Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 d77b0c4e633b9cb6…

MALICIOUS

Office (OLE) / .XLS

15.0 KB
MD5: 7add96e14c1c00c252f273523b587ca7 SHA-1: 5a8a72f9666f3b96dfe0482d80e5ed92af8c5d71 SHA-256: d77b0c4e633b9cb6379efa0c03a98d735517264336000f6d5cc9a2f888b1e232
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro designed to execute code. Critical heuristics indicate the use of Shell() calls and character-shift decoding to obfuscate a command, likely for payload execution. ClamAV identifies this as 'Xls.Dropper.Agent-7650447-0', suggesting a dropper functionality. The VBA macros are designed to download and execute a second-stage payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL
    VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
  • ClamAV: Xls.Dropper.Agent-7650447-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7650447-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.

FilenameKindSourceSize
macros.bas
6050018ef14f3ae583e021341b2ea4bf9a449601fb20b5dbd2552ff74898d452		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4752 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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