Office (OLE) malware analysis — malicious · 9343e6ba78826ca8

MALICIOUS

Office (OLE)

90.5 KB Created: 2020-07-13 15:38:54 Authoring application: Microsoft Excel

MD5: c672ca283185188c624c8094e7b542b8 SHA-1: f1de99d7949953165a01e2f1e7a082e1b8cf6b64 SHA-256: 9343e6ba78826ca80a012ccf6f53a8da5b22b09103b2538546be3209f596b9ec

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro that utilizes dangerous functions, specifically RUN. The macro sheet contains a string that appears to be a URL, which is likely used to download and execute a second-stage payload. ClamAV also detected this file as a 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-8885385-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-8885385-0
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` `79ebf0757562d1e83eb3472d300d129c116d934b1de308e1e2d28b8128a158ae`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	22745 bytes

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