RTF / .DOC malware analysis — malicious · 09434f32daff556a

MALICIOUS

RTF / .DOC

1.85 MB

MD5: f1ea191a77cc85a11a7b42e8da4ca08d SHA-1: 414ce69fb0128f48be5013a72674e2a5073ada83 SHA-256: 09434f32daff556adb8086e75b646f6bd457c1aa8cfcddda50f4eef8d0ae96b5

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing OLE object data, specifically related to Microsoft Equation Editor. Critical heuristics indicate the presence of CVE-2017-11882, a known vulnerability that allows for arbitrary code execution. The excessive hex data and high entropy of the embedded artifact suggest it is a packed or obfuscated payload, likely downloaded and executed by exploiting this vulnerability. The document itself contains no readable content, further supporting its role as a malicious dropper.

Heuristics 6

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 ~1934KB 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
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_off00000b68.bin` `2d9645eca0d3e1be248b85dbb117727c6ffcfb48a11590f77452c2c9b5083c8d`	rtf-objdata-decoded	RTF \objdata at offset 0xB68	967183 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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