Office (OLE) / .XLS malware analysis — malicious · 57410a92533bb534

MALICIOUS

Office (OLE) / .XLS

285.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: 584cedaa248c78101ccbbb18728d8560 SHA-1: 254249a8f12fb2b1f6a739d0952c31bdf6c324fa SHA-256: 57410a92533bb5346a63f67dbed4b889ed1c0781651a5d5997ab2f0ce5f2b6e1

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The file contains VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell. This indicates an attempt to execute arbitrary commands upon opening the document, a common technique for downloading and executing further malicious content. The presence of Shell() and CreateObject calls further supports this malicious intent.

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` `a787d7a86a1ac026f321f1bbb23b3147f0b30503139a877164125ef323435d9d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12556 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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