Office (OLE) / .XLS malware analysis — malicious · 402764c90c870fa2

MALICIOUS

Office (OLE) / .XLS

270.5 KB Created: 2021-07-24 09:17:42 Authoring application: Microsoft Excel

MD5: 4b1dfcc803638984599294c70b9f707e SHA-1: 33b568e5f9374a76ed2fa183afc7e74281c8ae11 SHA-256: 402764c90c870fa2eb17282ffeffe95e8439d3622976d7391ee9cd1d43d491cd

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for executing malicious code upon opening the document. Critical heuristics indicate the use of Shell() and WScript.Shell, suggesting the macro attempts to execute external commands or download additional payloads. The presence of a long encoded blob and script execution terms within the extracted artifact further supports this. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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.
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a60b3b0cc6d294233a670146081e8e36e63be149b7d15c783bb00ad5160483b0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	54841 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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