MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1140 Deobfuscate/Decode Files or Information
The sample is an OLE document containing a large slack space anomaly and an embedded PE executable. The document body presents itself as various application forms, likely a lure to trick the user into interacting with the embedded malicious executable. The presence of XOR-encoded strings and PEB access suggests the embedded executable is designed to evade detection and potentially download further payloads.
Heuristics 4
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XOR-encoded strings (key 0x97) critical SC_XOR_ENCODEDFound 1 Windows library/API name(s) XOR-encoded with single-byte key 0x97: 'RegOpenKeyExA'
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Embedded PE executable critical OLE_EMBEDDED_EXEMZ/PE header found inside document — possible embedded executable
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PEB access via FS segment (x86) high SC_PEB_ACCESSPEB access via FS segment (x86)
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 86,016 bytes but its declared streams total only 21,308 bytes — 64,708 bytes (75%) 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).
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_office_00010a00.exeb0252450c6862ac2ba16cd64f7721e41946080b621373baa0f6987e42fbbb964 |
embedded-pe | Office MZ+PE at offset 0x10A00 | 17920 bytes |
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