Office (OLE) / .XLS malware analysis — malicious · 9eb9310727ffdb94

MALICIOUS

Office (OLE) / .XLS

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

MD5: d250b8557d5d68f4d70782b11314f87e SHA-1: ca72a8a955e2fc0695ad865de3a4b27225c8e057 SHA-256: 9eb9310727ffdb9477ec6fc074cdf96a6851c10122a75bca6aeb8a370d36abc4

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.004 JScript/VBScript

The sample is an Excel 4.0 spreadsheet containing an Auto_Open macro, which is a critical indicator of malicious intent. The macro utilizes the URLDownloadToFile API, a common technique for downloading second-stage payloads. The presence of a lure to enable macros further supports this. The macro is configured to download content from the URL http://int.boogieapparel.co.id/jvkuykqpn/, likely to execute further malicious code.

Heuristics 5

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical 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.
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.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `ec0714f458f545868feeb77a213e9463d6be5353f1c46da2106dd62e57f53688`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2974 bytes

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