Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c19eb6f050ef78ce…

MALICIOUS

RTF / .DOC

1.94 MB
MD5: 303698732a03a6376aee728b7d12e891 SHA-1: 26b2b08ef9209bc5e67a5e70dc76bf1e8f2fd612 SHA-256: c19eb6f050ef78ce65766906f1f3ad26693033c745f1ee247fab8ccdb77354b5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1071.002 Application Return-and-Execute T1566.001 Phishing

The analysis reveals a weaponized RTF document exploiting CVE-2017-11882/CVE-2018-0802 via the Equation Editor. The presence of the Equation Editor ProgID, the large OLE1 object with high entropy, and the extit{objupdate} control word strongly indicate a malicious intent to trigger remote code execution. The document forces the instantiation of the vulnerable Equation Editor component, allowing for arbitrary code execution. This aligns with known Equation Editor RCE delivery mechanisms.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2037KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003d.bin
15656c7f02e719795ee9ad354239c0e3b45109f9dfa1e9b3d98bb1ba0df526aa		 rtf-objdata-decoded RTF \objdata at offset 0x3D 1018775 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.