RTF malware analysis — malicious · c63a73d9cacc8bda

MALICIOUS

RTF

381.6 KB First seen: 2020-05-25

MD5: ca60856645f9b3d0e0080485876d4b07 SHA-1: e4cf74791fd999d1b3c9286b8c7663ca3c12b015 SHA-256: c63a73d9cacc8bda5b0948b27bb1f58845399f7becc7ea6d838079d004677143

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically related to the Equation Editor. Heuristics indicate a critical vulnerability (CVE-2017-11882) was exploited, which typically leads to the execution of a second-stage payload. The extracted artifact 'objdata_00_off000007e5.bin' is the decoded payload from this exploit.

Heuristics 5

Decoded Equation Editor payload + PE critical CVE likely RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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.
\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 1 \objdata section(s) — embedded OLE objects
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
`objdata_00_off000007e5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7E5	194348 bytes
SHA-256: `a17290bc94721dc3f0cb04a4e870e86c6ad3c7fce9a4bf6b343af4b182f601f2`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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