Office (OLE) / .XLS malware analysis — malicious · ce74cfa2aa4dd027

MALICIOUS

Office (OLE) / .XLS

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

MD5: 9a9f892fd163956db1fe8da04de2b9f4 SHA-1: 27d4dec8c875e2d4f5bbc3c6775eebe3e2db74d5 SHA-256: ce74cfa2aa4dd027ed46315c5332d681686cdf3d8fc81b119b742550bc053086

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.004 Scripting: PowerShell T1204.002 Malicious File: User Execution: Malicious File T1059.001 PowerShell T1204 User Execution

The file is an Excel spreadsheet containing both VBA and XLM macros. The presence of a Workbook_Open macro and a heuristic indicating a 'lure' to enable macros suggests the document is designed to execute malicious code upon opening. The XLM macro sheet contains dangerous functions, including 'RUN', which is often used to execute arbitrary commands or download payloads. The embedded URL http://tak-tik.site/crun20.gif is likely used to fetch a second-stage payload. The use of ShellExecute and URLDownloadToFile APIs further supports the payload delivery and execution.

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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