Office (OLE) / .XLS malware analysis — malicious · 82bc93a51204f609

MALICIOUS

Office (OLE) / .XLS

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

MD5: 11888043ccc547447f1dded7961f34bd SHA-1: 7ccc31f428a172989634d9b4f7edd45e940b4fa2 SHA-256: 82bc93a51204f609c8d6000b2437eb92809cf4589c5f2abd96a713e79e6ff7cd

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting: PowerShell T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains a Workbook_Open macro and references to ShellExecute and URLDownloadToFile APIs, indicating it attempts to download and execute a payload. The document body contains an embedded URL, likely the source for the payload. The presence of both XLM and VBA macros, along with the use of dangerous functions like RUN, suggests a downloader or droppper functionality.

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://tak-tik.site/crun20.gif�
- http://tak-tik.site/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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