Office (OLE) / .XLS malware analysis — malicious · 5df793ee7cad1ea6

MALICIOUS

Office (OLE) / .XLS

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

MD5: 5fac1c8cce58efb1c836a3b35a72baf8 SHA-1: a26068ea8dadb7be68f96a3ce12d14e87d8e4672 SHA-256: 5df793ee7cad1ea60771a31717a5bc25129c684bae6aedd941d69fa0fad88a7b

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains Excel 4.0 macros that are configured to automatically execute upon opening. The macros use obfuscated PowerShell commands to download a file named 'ye.exe' from 'https://tinyurl.com/y4pthed2', move it to the user's AppData directory, and then execute it. This indicates a downloader or droppper functionality.

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` `3c9a8b2b26691bf84fd305f239ba1d18a729afdd56828b8b22b78f3c83ca582e`	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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