Office (OLE) / .XLS malware analysis — malicious · 62081b20b3af4e7d

MALICIOUS

Office (OLE) / .XLS

26.0 KB Created: 2021-07-29 19:03:34 Authoring application: Microsoft Excel First seen: 2022-07-21

MD5: b2a05300c2aca5f1314c23f2ec0a1579 SHA-1: 9d724f81ae25824f629c02e2db63116c6f9461f2 SHA-256: 62081b20b3af4e7d455b4e47754288c6bf7fabf55c5805950c289222bc14a585

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled workbook that uses an 'Auto_Open' entry point to execute its payload. It displays a lure to the user, instructing them to enable macros to view the document content. Upon enabling, the macro attempts to download and execute a second-stage payload from the URL https://www82.zippyshare.com/d/FftVuRzJ/23818/1.exe.

Heuristics 6

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
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.
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
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://www82.zippyshare.com/d/FftVuRzJ/23818/1.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `fdfd572f634ae55a07391955f3661b232b451319e0332e9c9420c1f0f6ed7794`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	974 bytes

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