Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 cad51ce005136fb0…

MALICIOUS

Office (OLE) / .XLSX

653.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 4651ce2f0c8521aee14bec877dc6403a SHA-1: 3538ecd3d28c1d84c0653ee9b2ff9dca2beddcf4 SHA-256: cad51ce005136fb09209050f26fe8d5c7b5d09cdc2f14331534c9acd764b8216
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the macro is designed to execute external commands upon opening. The presence of 'wscript' and 'CreateObject' calls further suggests the execution of scripts or external processes. The ClamAV detection as 'Xls.Packed.Logan-9738662-0' confirms its malicious nature. The primary intent appears to be downloading and executing a second-stage payload via the shell command.

Heuristics 8

  • 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
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c002a21b25eb16c7cf03a813431739fc85b8749f5f8d813ff87921f514f0b8e4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22654 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
50bbdd9fbbbbfb058d8ce90c36c6dd737df05c51155ec25e62815722e58296e1		 ole-package OLE Ole10Native stream: MBD00356439/Ole10Native 439791 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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