Office (OLE) / .XLS malware analysis — malicious · 5421a06f84e17314

MALICIOUS

Office (OLE) / .XLS

34.0 KB Created: 2020-05-20 08:47:01 Authoring application: Microsoft Excel

MD5: 8b885efb5550c2f5b40b23ea8ecf0943 SHA-1: 2be74899763de480e4c320cc019acd4f20b9979d SHA-256: 5421a06f84e1731435298ca1c0569059d4d6ab81463ef7f0e5515ebf60bb520e

340 Risk Score

Malware Insights

MITRE ATT&CK

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

The presence of a Workbook_Open macro and multiple critical heuristics related to VBA macros, WScript.Shell usage, and Shell() calls indicate that this Excel file is designed to execute malicious code upon opening. The script likely uses WScript.Shell to download and execute a second-stage payload, a common technique for initial access and further infection. No specific family could be identified, but the execution method is clear.

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` `1e78ef91d5ebc8b9e8cd5a9901309ff97e3e0b2627d5f260bdc59836fd0b63ec`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3131 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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