Office (OLE) / .XLS malware analysis — malicious · f42acb74b6d24ab4

MALICIOUS

Office (OLE) / .XLS

62.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 951269ba1fce9b1b19bf075e3c9fd6c4 SHA-1: 4d575c41c78154b7bc2b4c316f5b9493d8f22fc2 SHA-256: f42acb74b6d24ab469c821f502680a4e0e01ac3fffe1024dece6eb1152356795

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.004 PowerShell T1204 User Execution T1059 Command and Scripting Interpreter

The file is an Excel spreadsheet containing both XLM and VBA macros. The presence of `OLE_XLM_AUTOOPEN` and `OLE_VBA_WBOPEN` heuristics indicates that macros are configured to run automatically. The `SE_ENABLE_LURE` heuristic suggests the document prompts the user to enable macros. The `SC_STR_URLDOWNLOAD` heuristic indicates the macro attempts to download a file from the embedded URL `http://blog.vokasidev.com/crun20.gif`. This functionality is consistent with a macro-based downloader.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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 http://blog.vokasidev.com/crun20.gif�
- http://blog.vokasidev.com/crun20.gif

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `d4222e1ad83b892546402a65bce1342319760d5f0e17d0c73ae5f07e792beb86`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	9447 bytes
`macros.bas` `c29faf2da8b6b84c63880f8f3ff09f138acdaa94ad9406cab75b546ae0e54428`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	979 bytes

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