Office (OLE) / .XLSX malware analysis — malicious · 483deb3d441c2a81

MALICIOUS

Office (OLE) / .XLSX

378.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: b1069c4a6695deb4833059aac4d01ffa SHA-1: 68be22ac28c85d2cc31e50fab83d7783a8c15709 SHA-256: 483deb3d441c2a81b8a0fab0b0cd5d90173724096cb9ef00dcb7ffdfa3a7e8cb

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an "enable macros" lure to trick the user into executing malicious code. The presence of an Auto_Open macro and the "SE_ENABLE_LURE" heuristic indicate the intent to automatically run code upon opening. The extracted URL, http://rmdwk19obfzrq03ohby.xyz/apple.gif, is likely used to download a secondary payload.

Heuristics 3

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.
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` `855e443b676f37217d33677a9c6a10a49b0648d00e8aa00f6d93fbdd2229abce`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4016 bytes

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