Office (OLE) malware analysis — malicious · 01c1a0b20b22fb65

MALICIOUS

Office (OLE)

140.5 KB Created: 2007-10-07 05:42:27 Authoring application: Microsoft Excel

MD5: ffc78f0ca62c9ad99e8cc4870b6b82a7 SHA-1: 7da3bdace35dd43fe4979e9c576dd0358e420295 SHA-256: 01c1a0b20b22fb65e95e84d1d1c03304fec3ea0ac779a5f7f7ede6b3f76c13d3

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel document containing a VBA macro that is configured to auto-execute upon opening the workbook. The heuristic 'OLE_VBA_PCODE_AUTOEXEC_EXEC' indicates that the macro uses 'Shell' to execute code, and the 'SC_HEAP_SPRAY' heuristic suggests a heap spray technique, often used to facilitate exploitation. The ClamAV detection 'Xls.Dropper.Agent-6332941-0' further confirms its malicious nature as a dropper. The VBA code itself appears to be heavily obfuscated, but the presence of API declarations for file operations and the auto-execution trigger strongly suggest it's designed to download and execute a secondary payload.

Heuristics 5

ClamAV: Xls.Dropper.Agent-6332941-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-6332941-0
Heap-spray pattern detected high SC_HEAP_SPRAY

Repeated 0x41 (A) bytes found
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.
VBA project contains no executable statements low OLE_VBA_MACROS

Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b98dc6c840a8c1a167e45a249d21648f2a8a93cc8064864c9f2231e64afa3627`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	74663 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 103 long base64-like blob(s).

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