Office (OLE) / .XLS malware analysis — malicious · bdb90d508fc0df9c

MALICIOUS

Office (OLE) / .XLS

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

MD5: bf14405d862f2a5353da5bb05a5a7b9a SHA-1: 9a98d61754859d441ae7e441303fbe90af5ec292 SHA-256: bdb90d508fc0df9c505fcbac7dfa7ceb88ed01e138afaeca61861318b58384fd

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell

The sample is an Excel file containing both XLM and VBA macros. The presence of Workbook_Open and Auto_Open macros, along with heuristics for ShellExecute and URLDownloadToFile, indicates malicious intent. The document body contains a URL, suggesting it's part of a lure to download a secondary payload. The XLM macro sheet explicitly uses the RUN function, further supporting the execution of external code. The embedded URL 'https://staffordhvacservices.com/crun20.gif' is likely used to fetch and execute a malicious payload.

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