RTF / .DOC malware analysis — malicious · dda6c746a87c0540

MALICIOUS

RTF / .DOC

1.53 MB First seen: 2022-03-26

MD5: 4c5b18a1cedc0ff791f809198a3289de SHA-1: b5037835b5f91239deed0f3b1ac633e51597efab SHA-256: dda6c746a87c05400d60052f92d8003225be25c4afe3ebdefb5add274dc4a471

240 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model Hijacking T1059.001 PowerShell

The RTF document contains OLE object data, specifically related to Equation Editor, and triggers the CVE-2017-11882 vulnerability. This exploit is known to embed and execute a payload. The large amount of hex-encoded data within the OLE object further suggests the presence of a hidden payload. While no specific script was extracted, the exploit mechanism itself indicates the intent to download and execute a second-stage payload.

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 ~1595KB 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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000142a.bin` `9621b79f6a7749685c04c9b13d65c9ddb6448bc10d43aa978025a5400b562ac0`	rtf-objdata-decoded	RTF \objdata at offset 0x142A	797685 bytes

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