RTF / .DOC malware analysis — malicious · c3d1d7dd4e6a6e7e

MALICIOUS

RTF / .DOC

300.6 KB

MD5: b1412a98a54a0a6a7522bc132499def6 SHA-1: 43f48ba863f23841c31cfbec851b14342a2a7415 SHA-256: c3d1d7dd4e6a6e7ed3e727e516f0e0dd87207b11175f304d7dc4396bb1c8395b

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability in the Equation Editor OLE object. This vulnerability is known to be used to download and execute arbitrary code. The presence of OLE object data and the specific heuristic firings strongly indicate this exploit is being used as a delivery mechanism for a secondary payload.

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_off00001917.bin` `daa7fadf54fc734d618d165d88dd7c6ef7cb50e416892332a4ac3ce7677420b4`	rtf-objdata-decoded	RTF \objdata at offset 0x1917	100230 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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