RTF / .DOC malware analysis — malicious · 01d02c3639d02b22

MALICIOUS

RTF / .DOC

1.80 MB First seen: 2022-05-10

MD5: 03584230c47be17c0680d949c6575396 SHA-1: a8341508989d5680a4877749ce2bd067ba3c71cd SHA-256: 01d02c3639d02b22416c5bcb698156c86dc5f30088a589dd8d79e3e3165a4142

220 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 the Equation Editor. Critical heuristics indicate the presence of CVE-2017-11882, a known vulnerability exploited for client execution. The large amount of hex-encoded data within the OLE object suggests it is used to hide a malicious payload. No document body or script content was available for further analysis.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1884KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001718.bin` `8fb5332763a5c4f068f5da280268c003c2d440fdeebc7a81b3072d8249d64962`	rtf-objdata-decoded	RTF \objdata at offset 0x1718	942205 bytes

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