Office (OLE) / .XLS malware analysis — malicious · bcc1731e3f2dc477

MALICIOUS

Office (OLE) / .XLS

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

MD5: e1bddad335af1cbf14788dfd3b898a59 SHA-1: 1bbc9138c1f5fbd83c0484b2e00fc7d0ec03bb4d SHA-256: bcc1731e3f2dc4772be5ad445247f717b82ec84eda5f86adc57824241dc77823

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an 'Auto_Open' function to execute. It contains a lure to enable macros and uses the 'REGISTER' and 'EXEC' functions to call 'rundll32' and download a payload from 'http://klaciiaaadvokatpengacara.com/eogwvza/'. The macro also attempts to construct a path for a second-stage payload in '..\AppData\Roaming\Herti.H48'.

Heuristics 5

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.
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
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `a15a6d51ac3b5e8ccddd675e71b8af96d7e12c0b9056ec71ea87085db274c193`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1764 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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