RTF / .DOC malware analysis — malicious · ed4a9807b1238e59

MALICIOUS

RTF / .DOC

457.2 KB

MD5: efbc49713acdd956e84b4003f8523106 SHA-1: 2c5e892ea44d7e0f0dd2a0b0d57ef30a6da70c2d SHA-256: ed4a9807b1238e593b5c82144685e0fe11d065630d292e9efb79b8cc2ffaab32

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to the Equation Editor component, which is known to be used for delivering malicious payloads. The embedded object, objdata_00_off00000751.bin, is a PE file, suggesting it's the second-stage payload. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

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.
Decoded Equation Editor payload + PE critical 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.
\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_off00000751.bin` `5ccd4bb432f90524e7e0c1c5f146130744665f995c6b15540b6657882e53519f`	rtf-objdata-decoded	RTF \objdata at offset 0x751	233096 bytes
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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