Office (OLE) / .XLS malware analysis — malicious · 83fdaba14a218d39

MALICIOUS

Office (OLE) / .XLS

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

MD5: a5f4ade234381968c00eb35ce2bfd374 SHA-1: 0a4562c4c9dfe5f49047b9f13d998e9117ec736d SHA-256: 83fdaba14a218d3923aa2dd455410e53f53cc8510b208faeba79dd05dfd92f09

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.004 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols T1105 Ingress Tool Transfer

The sample is an Excel spreadsheet containing both XLM and VBA macros. The 'Workbook_Open' VBA macro and XLM Auto_Open functions are designed to execute automatically when the document is opened. The heuristics indicate that these macros reference ShellExecute and URLDownloadToFile APIs, suggesting they are intended to download and execute a second-stage payload from the embedded URL. The document body also contains the same URL, reinforcing its role as a lure. The presence of both macro types and the explicit use of download functions points to 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 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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