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

Static analysis result for SHA-256 902d1dee3000361a…

MALICIOUS

Office (OOXML) / .XLSM

254.3 KB Created: 2026-04-02 06:26:39 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2026-06-03
MD5: c50365800609fc9a8883a92d68c76d1e SHA-1: 8cac3befc4da7a0bbad64d436d1923cfde11fa82 SHA-256: 902d1dee3000361a49b22d81c52a410a3521e06dcfd5b1422f46a5c2c3f80191
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro that utilizes WScript.Shell and CreateObject to download and execute a second-stage payload. The VBA code appears to be obfuscated but the critical heuristics indicate a download and execution pattern, likely involving a call to PowerShell to execute the downloaded file.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2e27bdfdb0b69849b4d4c67f339ebed0f2a6aac01065118a74bf7dbb589ea6d9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7520 bytes
vbaProject_00.bin
9498848e70ffd8f1e97ae27752e2755a8337495c3820e4237656782862f207f6		 vba-project OOXML VBA project: xl/vbaProject.bin 26624 bytes

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