Office (OLE) / .XLS malware analysis — malicious · 9360394c3444d2bb

MALICIOUS

Office (OLE) / .XLS

58.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-05-06

MD5: 791a899fe3e63563ae4434bceba5e5e3 SHA-1: 3efa63cd1369a53c1a4c7090cfd920c8d4511861 SHA-256: 9360394c3444d2bb96d0039ceff9ee5af3225ea06c034c76577f0fea54a911d1

340 Risk Score

Malware Insights

MITRE ATT&CK

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

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 WScript.Shell and a Shell() call, suggesting the macro attempts to run external commands or download additional payloads. The obfuscated script content, while not fully decipherable, further supports the malicious intent. No specific family could be identified.

Heuristics 8

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7c2e4d2303a65de235a6c687922f7d166ea25d5871619aed48e474b3988d61a6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12594 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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