Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 64022efbff67c341…

MALICIOUS

Office (OOXML) / .XLSM

583.6 KB Created: 2020-06-22 10:41:03 UTC Authoring application: Microsoft Excel 16.0300
MD5: 580f56b9a2519844d3e390cb5d272c81 SHA-1: fffd7976f5aec1541ca518e2482ca1a9a16994aa SHA-256: 64022efbff67c341a948c383e2be37dc12977c0feb3ce8b0716f3ebad023760d
350 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This XLSM file contains a Workbook_Open macro that utilizes the Shell() function, indicating an attempt to execute arbitrary commands. The presence of ClamAV detections for 'Xls.Packed.Logan-9738662-0' further confirms its malicious nature. The macro likely serves to download and execute a secondary payload, a common technique for initial execution.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Packed.Logan-9738662-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Packed.Logan-9738662-0
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Suspicious extracted artifact info 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.

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a3c052949c59e302fd60b694ae85b5a2dfaae0ef21b8d707971f17a493dfab8c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 39949 bytes
ooxml_oleobject_00.bin
f674740dfdf4fd4ded529c339160c8255cdd971c4a00180c9e3fc3f3e7b53799		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 404992 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin
63f71ea4dcec4be6df678369a2260d3535ebedcf62df4205f6cae8067d1682ec		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 398854 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
vbaProject_00.bin
d35d73ad65711bd5f2ad2a106ed18122ae03c00de18d010da46e86e2a335125a		 vba-project OOXML VBA project: xl/vbaProject.bin 185344 bytes
Detection
ClamAV: Xls.Packed.Logan-9738662-0
Obfuscation or payload: unlikely
emf_00.emf
2189766dafc29210f2d28f558a75eb07e75c3da74ceb9a9e4c6706d735c1213a		 ooxml-emf OOXML EMF part: xl/media/image1.emf 7272 bytes

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