Office (OLE) / .XLS malware analysis — malicious · e11048c082c39ef3

MALICIOUS

Office (OLE) / .XLS

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

MD5: d4d3e5b981e9c50314d05d0f9c65f599 SHA-1: d27a84a4f63f9a6a96e14fb336a88388163c4ece SHA-256: e11048c082c39ef37d45954ee015e7005c9dbb16ec64f5196a9caa3395b495d5

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.004 Scripting: Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: User Execution: Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an Excel 4.0 (XLM) macro sheet with a Workbook_Open macro, indicating an attempt to automatically execute code upon opening. Heuristics indicate the use of ShellExecute and URLDownloadToFile APIs, suggesting the macro downloads and executes a payload from a URL. The document body contains an embedded URL, which is likely the source of the payload. The presence of an 'enable macros' lure further supports this attack pattern.

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 https://kawaguchikimiaindonesia.com/crun20.gif�
- https://kawaguchikimiaindonesia.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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