Xls.Dropper.Agent-7994405-0 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 af8a9d907d625adc…

MALICIOUS

Office (OOXML) / .XLSM

49.4 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: e5e419bb6e2abcaddd9619342aff081b SHA-1: f2f942f66c0030283a80b4c68aba9799b61e01e0 SHA-256: af8a9d907d625adc66f4f55d7db843199b69a01d61ab465ce5ad14189b429c90
320 Risk Score

Malware Insights

Xls.Dropper.Agent-7994405-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1137.001 DLL Search Order Hijacking

The file is an XLSM document containing VBA macros, including an Auto_Open macro, which is a common technique for initial execution. The presence of an Equation Editor OLE object and ClamAV detection as 'Xls.Dropper.Agent-7994405-0' strongly suggests a dropper functionality. The extracted artifact also shows signs of obfuscation and execution, indicating it's designed to download and execute a second-stage payload.

Heuristics 8

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject3.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Xls.Dropper.Agent-7994405-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7994405-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
af96889acb48771e17d8b44cab7c3db89f7bc97c49d9dfea6d4beccbf0136e92		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 53746 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
ooxml_oleobject_00.bin
7fd2f990e10ba06b1abbe4b4e06ac7b1a6910947b82df34e13a5c53b74471dc4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_01.bin
65f6718ce0c818c2a64d21d8ef36f1b834a52304cd1845388432ac199d5c6487		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_01_ole10native_00.bin
fe272dbd293dc592405cafcb2bfdd54546e65450468f39f37186f0edb9f0eca4		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1177 bytes
ooxml_oleobject_02.bin
89ad9915daedd642fc0ab8013fccf0b3329b824b5107c75c5eba9b31f59d2364		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 12288 bytes
ooxml_oleobject_02_ole10native_00.bin
a8a8a59d3eeb640372eaae5055be637b35d07e9f806a2d07e3f794f51eb3376d		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 9262 bytes
ooxml_oleobject_03.bin
39d219b004bbf676338ada81752cc1bf8911b7731f110ef7dcd7f80abc5298d3		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 98304 bytes
Detection
ClamAV: Xls.Dropper.Agent-7994405-0
Obfuscation or payload: unlikely
emf_00.emf
979dde2aed02f077c16ae53546c6df9eed40e8386d6db6fc36aee9f966d2cb82		 ooxml-emf OOXML EMF part: xl/media/image1.emf 4968 bytes
emf_01.emf
4d4d1e7b04c99dcb8e885915068ad6f74cc2333e91580cdae5ccaa00c427247f		 ooxml-emf OOXML EMF part: xl/media/image2.emf 1536 bytes

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