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

Static analysis result for SHA-256 5d12f3d6b8c04182…

MALICIOUS

Office (OOXML) / .XLSM

36.3 KB Created: 2025-03-06 20:16:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2025-03-13
MD5: 7ac07195f03358c51fbb2e422a8b5452 SHA-1: a4e0c6f0797f655c26d920cf8474e21815435455 SHA-256: 5d12f3d6b8c0418215b29ad3afb0a3448966a6eaeb02dca2e89d6bff5d8e2570
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro that prompts the user to enable editing. Once enabled, it calls a VBA script that uses WScript.Shell to download and execute a payload from the URL 'https://tursiian.com/7z.txt'. The obfuscated shell command and the use of CreateObject and Shell() indicate malicious intent.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tursiian.com/7z.txt
    • https://f005.backblazeb2.com/file/newuploavir/newpoveno.zip

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
37326adf68796f0b3e3b726697692e5ce6a4ea22a1abd633296c83d71509a425		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 10234 bytes
vbaProject_00.bin
8a633faf806f95aae583427823b92cd5b6279a40dd91fd7947df1ddf76d9262c		 vba-project OOXML VBA project: xl/vbaProject.bin 59904 bytes
emf_00.emf
ead6151c56e0bea03c53bdb26bac6cd773cd5ffdf94405b31dd4450363dcb596		 ooxml-emf OOXML EMF part: xl/media/image1.emf 2744 bytes

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