Xls.Dropper.Agent-7669264-0 — Office (OOXML) / .OLE malware analysis

Static analysis result for SHA-256 e3fdb85b2fd99bac…

MALICIOUS

Office (OOXML) / .OLE

47.1 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: 5e92ecd1f85ef56f038c19afbe9993f6 SHA-1: e772bb0c9884962394b5270db1c485233d67a5f3 SHA-256: e3fdb85b2fd99bac4dc35eb674a13e8a4cc4c566abda4b40e656120541c17979
440 Risk Score

Malware Insights

Xls.Dropper.Agent-7669264-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a macro-enabled Excel document containing a VBA project. The presence of an Auto_Open macro, coupled with critical heuristic firings for Shell() and WScript.Shell usage, indicates that the VBA code is designed to execute arbitrary commands. The ClamAV detection of 'Xls.Dropper.Agent-7669264-0' further supports its role as a dropper.

Heuristics 10

  • 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.
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Dropper.Agent-7669264-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7669264-0
  • 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
3b73d54762313aecf1c2e759b111f10a681d0b1febd808b73952dc6f4d64ae24		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 42462 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
ooxml_oleobject_00.bin
6cd73f15b74e03d90e8d8f88ec9cbb3032bafeefc1026727883d9f3cc83c62b9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_01.bin
028e52b1a5701d8d0cf803e72bb193414294736fab8ad8977c7ba7800a30cc9e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 9216 bytes
ooxml_oleobject_01_ole10native_00.bin
3a169157dea321db85ceeb556602abea86afe3de02a6fc68fbd053f523ca389e		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 6383 bytes
ooxml_oleobject_02.bin
19730997e51774f05a442cbba4c9f7eef2aa2c145f6534727c388bd4e4733038		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_02_ole10native_00.bin
877eb03eec6e82e15782cbe5d874dfe402da73d4b3e99a9cdd3828d7be0a7183		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 982 bytes
ooxml_oleobject_03.bin
0c9d31088de78f428935cd17c09ab7e38b52b87c4adf6055e04d108b0e386aec		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 69632 bytes
Detection
ClamAV: Xls.Dropper.Agent-7669264-0
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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