Office (OLE) / .XLS malware analysis — malicious · 7a47a8ec1c5a1964

MALICIOUS

Office (OLE) / .XLS

62.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: cc137aefd6445e3c329d645dcc9a234b SHA-1: e445104a7826b987cf008184f6bf2ce60d4da986 SHA-256: 7a47a8ec1c5a19646950712b4bd17427801b0f7fa8eaf9c0f18e82012445ba35

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1218.010 System Binary Proxy Execution: Regsvr32

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that uses an Auto_Open macro to execute. It impersonates a document signing service to lure the user into enabling macros. The macro contains a command to execute 'regsvr32.exe -s C:\Flopers\Flopers2\Bilore.dll', indicating it attempts to load a DLL from a local path, likely downloaded from the embedded URL http://vishwalands.lk/edyvnyzzwdbp/.

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.
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
Document signing service impersonation lure medium SE_DOCUSIGN_LURE

Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `42919f6693f32a7db21ed616588027a9dbf0a80618c9894f415202c8ceb47b72`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2351 bytes

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