Office (OLE) / .XLS malware analysis — malicious · 40277271998b3485

MALICIOUS

Office (OLE) / .XLS

1.45 MB Created: 2021-07-29 19:03:34 Authoring application: Microsoft Excel First seen: 2022-02-16

MD5: d333c2ca445b457312bde0b9d58e90a6 SHA-1: b7d3e929b78b9f0f3d96ea971b0ce352186476f6 SHA-256: 40277271998b34858869a006e9338af601bf71d3d3bfee931160f484f2a19344

122 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that displays a lure message in Turkish and English, prompting the user to enable macros. Upon enabling, the embedded Auto_Open macro executes. This macro is likely responsible for downloading and executing a payload from the embedded URL: https://arturkarolczakshiola.com/zasa/fYiA22eXpUTT7uP.exe. The presence of the Auto_Open defined name and the reference to PowerShell strongly indicate malicious intent.

Heuristics 4

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.
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
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.
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://arturkarolczakshiola.com/zasa/fYiA22eXpUTT7uP.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `cb322c865fb7981c2b6fc2dcd75b3510d98aabf0c3ac84530621884d7cfa272e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1032 bytes

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