Office (OLE) / .XLS malware analysis — malicious · 4f8696a9fa832771

MALICIOUS

Office (OLE) / .XLS

603.5 KB Created: 2020-07-16 12:39:32 Authoring application: Microsoft Excel

MD5: e511d5d44cf2910cb1d6245d2f3652aa SHA-1: bd1addabe7755fa3116942bbc9c190c77f25c0db SHA-256: 4f8696a9fa832771c2e0a561ec5b12e0bde3f0afeda049c7e53ffc1b56e7bb09

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel 4.0 macro-enabled spreadsheet that contains an Auto_Open macro. This macro is designed to download and execute a payload from the obfuscated URL 'http://ebacq.omdlsizMJfxURLONwTFASUrgv\GkKyIBHUZQY'. The presence of the Auto_Open function and the use of dangerous formula APIs indicate a malicious dropper.

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.
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.
ClamAV: Xls.Dropper.Agent-8900293-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-8900293-0
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` `ea0e3b89a6a6987bc607119d9e592f09cd25cdc763b575cd03fd800c093fbead`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	22114 bytes

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