Office (OLE) / .XLS malware analysis — malicious · 2b0db62c56ce0553

MALICIOUS

Office (OLE) / .XLS

67.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-23

MD5: 9729363a5cdfee2598f93545b933043e SHA-1: be0c2937e23a7359a04366e9b27ccf1e3c32ee1f SHA-256: 2b0db62c56ce0553d5ba8842a53d17ff5d0b66ad397c3b9565af1cfe48e19364

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry that uses dangerous functions, specifically RUN. The DOC BODY section reveals concatenated URLs which are reconstructed to 'http://vipteck.com/wp-admin/user/B8d6jr4pBND2HExAmI/lJWa95VlQ/', 'http://salledemode.com/tgroup.ge/x4bc2kL4BzGAeUsVi/', 'https://airliftlimo.com/wp-admin/iMc/', and 'http://kabeonet.pl/wp-admin/VWlAz5vWJNHDb/'. This strongly suggests the macro's purpose is to download and execute a second-stage payload from one of these URLs.

Heuristics 3

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.
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` `67f6b164c4d6ea1ea8efe2ccdff056dde7fd1072da2bb20afe3b275864086c71`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7678 bytes

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