Office (OLE) / .XLS malware analysis — malicious · c58344f5409f59dc

MALICIOUS

Office (OLE) / .XLS

49.0 KB

MD5: 0fe6e10e4918f1babb2e7d1caa3f3675 SHA-1: 1c280f2cd869c61cb03bc5170d1e9ef5462fe398 SHA-256: c58344f5409f59dc36f3d14ffcaf30bcdbb2d7f8b3157c016ec0f360836a90a9

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro triggers the execution of a VBA function that creates a file named 'mozilaupdates.js' in the user's public directory using the Scripting.FileSystemObject. It then writes content from a spreadsheet cell into this file. Subsequently, another VBA function uses Shell() to execute 'wscript.exe' with the newly created JavaScript file as an argument, indicating a downloader or execution of a second-stage payload. The obfuscated JavaScript code further suggests complex execution logic, potentially involving network communication or further payload delivery.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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.
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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` `a7b3d17f45f4f08612242b40ce63f13589a45919cd8360f94edb1f07b10b4278`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1659 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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