RTF / .DOC malware analysis — malicious · d9867bff3beee631

MALICIOUS

RTF / .DOC

2.24 MB

MD5: c6a05784a4d3f27b85ad311e8dd64607 SHA-1: 7bd8a297f3a95fa6e6b756094785d90d11f26099 SHA-256: d9867bff3beee631dde942e6425b7ef4edce67b251453d360e71ec655b929bc9

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_ACTIVATION_RELATED` heuristics strongly indicates this exploit. The `RTF_OBJUPDATE` heuristic suggests that the embedded object is configured to automatically activate, leading to arbitrary code execution. The document body contains obfuscated VBScript-like content that appears to be related to file system checks and potentially downloading further payloads, though it is heavily truncated and difficult to fully parse.

Heuristics 5

Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED

RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger 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 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001202.bin` `ec6eab6563f0e51dd56fe15c2c974e4a234d58ebf596ccce249df7e1265cc959`	rtf-objdata-decoded	RTF \objdata at offset 0x1202	27215 bytes
`objdata_01_off0001ceab.bin` `420dd98e97f2838b69fef2f6d85eff987f569ee4001ae1d6183f751f72b4b727`	rtf-objdata-decoded	RTF \objdata at offset 0x1CEAB	480330 bytes

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