Office (OLE) / .XLS malware analysis — malicious · 166989f61fb15732

MALICIOUS

Office (OLE) / .XLS

66.5 KB Created: 2020-09-20 21:17:44

MD5: 57d2e6d7a94b56acfc61035d2577a86a SHA-1: 69248b27552383513f0b4d5839a63386849217dd SHA-256: 166989f61fb157324d0c29d69d5aae0aa2a7813c9f4a0c1ab6506730dd66b434

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 macros that are automatically executed upon opening. These macros construct and run a PowerShell command to download a file named 'ye.exe' from 'https://tinyurl.com/yxmkb9y9' and save it to the user's application data directory. Subsequent macro commands then execute the downloaded file.

Heuristics 5

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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `3b0a9e45262721c41138faeb87e0e777b02394a5e68f80554e6e9f296d4fae67`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	811 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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