MALICIOUS
168
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
The file is an Excel spreadsheet containing VBA macros. Heuristics indicate the presence of XOR-encoded strings and an appended payload, suggesting the macros are used to download and execute a malicious second-stage payload. The VBA project itself contains no executable statements, implying the malicious code is likely obfuscated or dynamically generated.
Heuristics 5
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XOR-encoded strings (key 0xDE) critical SC_XOR_ENCODEDFound 5 Windows library/API name(s) XOR-encoded with single-byte key 0xDE: 'GetProcAddress', 'CreateProcessA', 'ExitProcess ', 'CreateFileA ', 'CreateFileW '
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 445,026 bytes but its declared streams total only 240,528 bytes — 204,498 bytes (46%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOADOLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
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Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOCReference to VirtualAlloc API
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VBA project contains no executable statements low OLE_VBA_MACROSDocument contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas481031c20227961d1e7d207d0bb17c79a9001efbdb37ac509a4ff93acb047bf0 |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 606 bytes |
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