Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 3861795ece849d6b…

MALICIOUS

Office (OOXML) / .XLSM

35.7 KB Created: 2019-07-05 14:51:46 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-08-16
MD5: b54c993e941836bf2c9c69948b30bcf0 SHA-1: a3e6234b5310a3918b9e01c08badf3eb5f44a4b8 SHA-256: 3861795ece849d6b417a3c9870a7e0a0eccd27f74e706b9242d94d5e8885b705
290 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an XLSM document containing VBA macros, with a critical heuristic indicating the presence of a Shell() call within an Auto_Open macro. This suggests the macro is designed to execute a command upon opening. ClamAV detection further confirms its malicious nature as 'Xls.Dropper.Agent-7398287-0', indicating it likely acts as a dropper for other malware.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-7398287-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7398287-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d07ef0a0fb9cbf7d9ad69557e46c13b231cef15c76323c7e6029cf4ce69c30ab		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5818 bytes
vbaProject_00.bin
9cd44ba1966a71ad7d8261032e9045b4748c7508e062ac61fe3d13741dd9cb4b		 vba-project OOXML VBA project: xl/vbaProject.bin 40960 bytes
Detection
ClamAV: Xls.Dropper.Agent-7398287-0
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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