Office (OLE) / .XLS malware analysis — malicious · 7cf49034385c37bd

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel

MD5: 0bba0d2286077a88f2d5e82676e59d3a SHA-1: 85670f4715883c4b0411518e8d92516bce3b64d1 SHA-256: 7cf49034385c37bdd1fc06c7902b19acd04ca876fae87bd5b828a88f42fc3eb6

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open defined name, indicating automatic execution of macros upon opening. The document body contains obfuscated text that appears to be instructions for downloading and executing a file from one of the two provided URLs. The presence of an 'enable lure' heuristic further supports the conclusion that the document is designed to trick the user into enabling macros to initiate a malicious download.

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.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL https://hermescomm.net/x9NvrhL0/lena.html
- https://asistenciajuridicaintegral.com/6YiCkNix5/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `be629cb484f8d82e38c4234ddbad4f1755e762b9c1c8359642d99f8c77e6e858`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8812 bytes

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