Xls.Dropper.Agent-7084314-0 Office (OLE) malware analysis — malicious · 56b50146fd6cca67

MALICIOUS

Office (OLE)

834.1 KB Created: 2003-07-13 10:04:24 Authoring application: Microsoft Excel First seen: 2019-05-16

MD5: c556c137dc30ed12f2691f5a6b15d8ed SHA-1: 5f0743779cce5d90379b76b38b9c86f1fda31f2c SHA-256: 56b50146fd6cca6764bfed5144fc3e26d1e88099b349455e2d2cbcf919995848

582 Risk Score

Malware Insights

Xls.Dropper.Agent-7084314-0 · confidence 95%

MITRE ATT&CK

T1204.002 Malicious File T1105 Ingress Tool Transfer

This OLE document exhibits critical findings including an embedded PE executable and suspicious static triage signals, strongly suggesting it functions as a dropper. The presence of references to CreateProcess, ShellExecute, and URLDownloadToFile APIs indicates the file's intent to download and execute a secondary payload. ClamAV detections further corroborate its malicious nature as a dropper agent.

Heuristics 13

ClamAV: Xls.Dropper.Agent-7084314-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7084314-0
Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE

A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 854,136 bytes but its declared streams total only 12,288 bytes — 841,848 bytes (99%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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.
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect API
CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMS

The file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the 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://ocsp.verisign.com0 In document text (OLE body)
- http://crl.verisign.com/ThawteTimestampingCA.crl0In document text (OLE body)
- http://crl.verisign.com/tss-ca.crl0In document text (OLE body)
- http://crl.microsoft.com/pki/crl/products/CodeSignPCA2.crl0OIn document text (OLE body)
- http://www.microsoft.com/pki/certs/CodeSignPCA2.crt0In document text (OLE body)
- http://office.microsoft.comIn document text (OLE body)
- https://www.verisign.com/rpaIn document text (OLE body)
- https://www.verisign.com/rpa01In document text (OLE body)
- http://crl.verisign.com/pca3.crl0In document text (OLE body)
- http://CSC3-2004-crl.verisign.com/CSC3-2004.crl0DIn document text (OLE body)
- https://www.verisign.com/rpa0In document text (OLE body)
- http://CSC3-2004-aia.verisign.com/CSC3-2004-aia.cer0In document text (OLE body)
- http://windowsmedia.com/redir/xpsample.aspIn document text (OLE body)

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_0000660a.exe`	embedded-pe	Office MZ+PE at offset 0x660A	828014 bytes
SHA-256: `f767593ef497605457216382fb405f603c81d5c525df838e9bdee8eacda83a04`
Detection ClamAV: Win.Trojan.Agent-6943819-1 Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmdln
`embedded_office_off00003605.ole`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x3605	840307 bytes
SHA-256: `1b9120f56fd9230e51e69153e8274a106d6e4a8dd2cce0a344fc65dc4b2b2203`
Detection ClamAV: Win.Trojan.Agent-6943819-1 Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmdln
`embedded_office_off00006480.ole`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x6480	828408 bytes
SHA-256: `c317a4bd9958e80ca7111394bb5889fc2dd6315d3b3cb4f2cefc4e367559fdeb`
Detection ClamAV: Win.Trojan.Agent-6943819-1 Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmdln
`embedded_office_0000660a_1.exe`	embedded-pe	Office MZ+PE at offset 0x660A	394929 bytes
SHA-256: `ad52f901e40604ab3c2ca993d90bab57aae815fee5894f2ed276bfd70e9a85e6`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmdln
`embedded_office_off00069bbd.ole`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x69BBD	421051 bytes
SHA-256: `bd2e597d24eb95a64f0a43bb9762b6b7cb4740703b538ff40730ccf59179b8e0`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmdln
`embedded_office_off0006d1c2.ole`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x6D1C2	407222 bytes
SHA-256: `72a4229d9057e432c8965fe069e29c3ee56a1192bb97ac4e4b8988e4f4e61b27`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmdln

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