Office (OLE) / .XLS malware analysis — malicious · d70803dc31e45825

MALICIOUS

Office (OLE) / .XLS

141.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: fa7354227422a339d34d662839e0aee2 SHA-1: 09c5bb8db08c53f00745262ba414fa093d6dd7f9 SHA-256: d70803dc31e45825416b5391969ab9042baa17c01e080382a4340cef54090c84

120 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 macro-enabled spreadsheet that impersonates DocuSign to lure the user into enabling macros. The presence of an Auto_Open macro indicates that it will execute automatically upon opening. The extracted URL, http://bearcatpumps.com.cn/css/tolkio, is likely used to download a second-stage payload. The XLM macro sheet contains an Auto_Open entry and the document body explicitly mentions DocuSign.

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
Document signing service impersonation lure medium SE_DOCUSIGN_LURE

Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `36753cf660f0709fa86ddcbc4a2a70bbd227d5a2ea27f7e28a3b15b989108842`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2152 bytes

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