Emotet Office (OLE) / .XLS malware analysis — malicious · b63ca3c43605e307

MALICIOUS

Office (OLE) / .XLS

78.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-13

MD5: d52a6a9715f60af536c15dfd57968cf1 SHA-1: 909b0b7eb1597990100d06baeac0e3c482206b85 SHA-256: b63ca3c43605e3073a63a2aa9f67d318711af34bc15f7680878440a871735bc2

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. The macros construct several URLs, including 'https://immobilgolfo.it/cgi-bin/Uf/', which are likely used to download and execute a second-stage payload. ClamAV detection further confirms its malicious nature, identifying it as an Emotet variant.

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.Downloader.Emotet-add2d22d2bc26dd0-9950243-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-add2d22d2bc26dd0-9950243-0
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` `214b0200160a0a56c6b45537e99f08bf5e131e2710192ec67ed6ddfaa9428b75`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6825 bytes

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