Office (OLE) / .XLS malware analysis — malicious · e3107603083a6d75

MALICIOUS

Office (OLE) / .XLS

61.7 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: 106a87839696187ce314a3e14592c76b SHA-1: 7e0d6db3cd07d0137db55958b17eec5eb15c565a SHA-256: e3107603083a6d759ddc850614107753492874c668f138f2adc2e08a0ff6548a

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet that uses a lure to prompt the user to enable content. Upon enabling, the Auto_Open macro executes a command to download a payload from the reconstructed URL 'http://87.251.86.178/pp/oo.html'. The macro also defines 'SSDGO' with the same command, suggesting an alternative execution path or a related payload URL 'http://87.251.86.178/pp/aa.html'.

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.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1514 bytes

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