Xls.Dropper.Agent-7670065-0 RTF malware analysis — malicious · e6b88bb1df2d2c4b

MALICIOUS

RTF

1.07 MB Created: 2020-03-30 06:29:00 First seen: 2020-07-24

MD5: 61767aeffc3b4f629eaa233162f0e2eb SHA-1: 81cb0db2fd10fac619b314beb5914a1c47db5b76 SHA-256: e6b88bb1df2d2c4bbda37e4391d1bb6a94757ce6e5ae9920a3217e67d78d8700

282 Risk Score

Malware Insights

Xls.Dropper.Agent-7670065-0 · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and uses \objupdate to force activation, indicating an attempt to exploit vulnerabilities. The critical finding of CVE-2017-8759 confirms exploitation for client execution. ClamAV detection as 'Xls.Dropper.Agent-7670065-0' suggests a dropper functionality, likely to download and execute a secondary payload.

Heuristics 8

CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
ClamAV: Xls.Dropper.Agent-7670065-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7670065-0
\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 ~1058KB of hex-encoded data inside \objdata sections — may hide a payload
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 13 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 13

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002cb7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2CB7	39470 bytes
SHA-256: `bf164cd793371274953c73c5d20ca2e241fef7d4a8e82267e9f4dc24685bed82`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off00016f86.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16F86	39470 bytes
SHA-256: `d7254cf13f0333fe371afd4ea81391741f30b08d6204909ec54cb204acb2ed69`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off0002b35c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2B35C	39470 bytes
SHA-256: `27c5b1ed11aea1a88b9c894ff6809635b0b7ccb1b220c37c39635a495052cd25`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off0003f732.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3F732	39470 bytes
SHA-256: `bdc6ce986f20645c3ba39c51743afef322682c030cfcc98518821e33306ba72a`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off00053b08.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x53B08	39470 bytes
SHA-256: `227f788792a18347682a82814ad2618c524d1dc96085b35443091fa7338915b9`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off00067ede.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x67EDE	39470 bytes
SHA-256: `64e3b61b978cf3cc9fe67238ce6e01b1ab5d3036a9432cd59e086291c5452e81`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_06_off0007c2b4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7C2B4	39470 bytes
SHA-256: `084658ed1b025044a725c6cefe0d3834df5808f414ed247fe23b6a44b9b539c8`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_07_off0009068a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9068A	39470 bytes
SHA-256: `8ccd7c11450bc3387a8bb09c43fd69b88902c90ad0f0b381502f19874ace094e`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_08_off000a4a60.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA4A60	39470 bytes
SHA-256: `b47048f52dac200d9c0a4f3f6b92abee90ae783727b4f30a00f5fa12c7b1e7e4`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_09_off000b8e36.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB8E36	39470 bytes
SHA-256: `b1d118b853b5d19f4018fc074a666297053f225783d2fda7077a129340d3d5bb`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_10_off000cd20c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCD20C	39470 bytes
SHA-256: `9391dc96e49dc5d46f72e8d159dabc7d4e455196509291937f0b330821af9ed3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_11_off000e15e2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xE15E2	39470 bytes
SHA-256: `2f94dc3942aa9d1f9586b5ac62f79243cd8d2f5a07e15409453ce19301d04199`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_12_off000f59b8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF59B8	39470 bytes
SHA-256: `80cd1b617f22d0640136a21539a66ca7e54b3e4caff869fd7c93f55fb006aced`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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