RTF / .DOC malware analysis — malicious · a858b7a573528d6e

MALICIOUS

RTF / .DOC

302.0 KB

MD5: 8512f16dc07732b7e0ae811497d6e49a SHA-1: 30ce7596d7292b03c5b585ea34d866d810a590bf SHA-256: a858b7a573528d6e497148cf8328cb63bb5710c57a761c9608309548707bd2b4

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability allows for the execution of arbitrary code, typically used to download and run a second-stage payload. The high entropy of the extracted OLE object further supports the presence of an embedded executable.

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.
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_off00001927.bin` `c058394eb8a7550a252cbf9aa370278ced37aa787d35e479f36ed7bea8101d5e`	rtf-objdata-decoded	RTF \objdata at offset 0x1927	100680 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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