Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a4f65315564c8a01…

MALICIOUS

RTF / .DOC

2.21 MB
MD5: 3f3c326776d1cca4140aec54899dd232 SHA-1: 22f2608fde8860771b405b82bea6ec7b90aa2e13 SHA-256: a4f65315564c8a012c86e0f02d90d07246dbcf41347c37b93cad43b39d24f61e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability via the Equation Editor. This exploit is known to facilitate the execution of arbitrary code. The embedded OLE object is activated by \objupdate, indicating a malicious intent to run code from the object. The document body contains obfuscated VBScript-like code that appears to be attempting to download and execute a payload.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001116.bin
016cb76c036c8e94032402c2299e1990f7dc3ca3fed0be25bb320f9e09f72ed2		 rtf-objdata-decoded RTF \objdata at offset 0x1116 26837 bytes
objdata_01_off0001c67f.bin
fe43efbadd674765243cb2580d9955cd54bcbea3b2eb0d6d648fe532cb7ef883		 rtf-objdata-decoded RTF \objdata at offset 0x1C67F 476202 bytes

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