Office (OLE) / .XLS malware analysis — malicious · 612f288a358f6bfa

MALICIOUS

Office (OLE) / .XLS

1.12 MB Created: 2019-10-22 07:10:34 Authoring application: Microsoft Excel

MD5: 9e2c88810138b0856bda192ae70d34c4 SHA-1: 579853532fadf08ef8ed7369d6d596af619bdf5a SHA-256: 612f288a358f6bfabc74937c10086107bede804413a5f6fd9e8f24f819669a0e

360 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The Excel 4.0 macro sheet contains an Auto_Open macro that executes a PowerShell command. This command downloads a file named 'messbox.exe' from 'http://www.google.net/tools/messbox.exe' and saves it as 'c:\mess.exe', then executes it. The PowerShell command itself is constructed using string concatenation to obfuscate the download URL 'https://officeservicecorp.biz/Lab.jpg'. This indicates a downloader or dropper functionality.

Heuristics 8

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.Dropper.Agent-8396254-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-8396254-0
Suspicious cmd.exe invocation with execution flag high SC_STR_CMD

Suspicious cmd.exe invocation with execution flag
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
Reference to bitsadmin (download) high SC_STR_BITSADMIN

Reference to bitsadmin (download)
Suspicious extracted artifact high 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.
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` `4f48e65961e6a5a1064b619028fb208ef6637cb6abbe4b83bc4756be35914119`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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