remediation / ad

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• hva
  • can-dcsync
  • hva-enum
  • hva-confirm
• check-pwdlastset
  • pwdlastset-hva
  • pwdlastset-bh-pwnable
    • bh-pwnable-users
    • bh-pwnable-groupmembers
• check-dacl
  • check-dacl-4-sam
  • check-dacl-all-with-aced
  • check-dacl-all-with-bh.py
• check-gpo
  • bloodhood.py
• check-schema
  • check-gpo-whencreated
  • group3r
• check-replications
  • replication-analyzer
  • repadmin
• netwrix account lockout examiner
• take-ad-snapshot
  • check-ad-snapshot
  • adexplorersnapshot.py

hva

can-dcsync

• T1003.006 DCSYNC

# 01 : bh pre built query to find dcsync principal
MATCH p=()-[:DCSync|AllExtendedRights|GenericAll]->(:Domain {name: ""}) RETURN p
# export json, name it 'dcsync.json'

# 02 : list the DCs with dig
dig -t SRV "_ldap._tcp.dc._msdcs."$zdom_fqdn | grep "^[a-zA-Z]" | cut -f1 -d"." | sort -u > $zcase"_dig_dc_list.txt"

# 02 : collect the ACLs for all DCs
ddir=`date +"%Y%m%d"`; mkdir $ddir; cd $ddir
for ztarg_sam in `cat ../$zcase"_dig_dc_list.txt"`; do
pywerview get-objectacl -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --sam-account-name $ztarg_sam"$" --resolve-sids > $zcase"_get-objectacl_"$ztarg_sam".txt"; done

# 02 : list to CSV
for file in `ls`; do awk '{if ($1 ~ /activedirectoryrights/) {split($0,a,":"); p=a[2]} else if ($1 ~ /securityidentifier/) {split($0,a,":"); print a[2]";"p}}' $file > $file.csv; done

# 02 : display principal granted for dcsync 
for file in `ls *.csv`; do echo $file; grep "extended_right\|generic_all" $file |csvlook -d ";"; done

# 03 : check the Replication-Get-Changes rights
# 03 : to debug : pywerview do not retrieve the ntsecuritydescriptor
#CN="DS-Replication-Get-Changes,CN=Extended-Rights,CN=Configuration,"$zdom_dn
#CN="DS-Replication-Get-Changes-All,CN=Extended-Rights,CN=Configuration,"$zdom_dn
#CN="DS-Replication-Get-Changes-In-Filtered-Set,CN=Extended-Rights,CN=Configuration,"$zdom_dn
#pywerview get-adobjectacl -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip -a $CN

# 03 : check the Replication-Get-Changes rights
# open adexplorer, copy the ntSecurityDescriptor of the 3 CNs up into 3 different files, grep for the SIDs
egrep -o "S-1-5-21-[0-9]{10}-[0-9]{10}-[0-9]{10}-[0-9]{1,6}" replication-get-changes.txt
egrep -o "S-1-5-21-[0-9]{10}-[0-9]{10}-[0-9]{10}-[0-9]{1,6}" replication-get-changes-all.txt
egrep -o "S-1-5-21-[0-9]{10}-[0-9]{10}-[0-9]{10}-[0-9]{1,6}" replication-get-changes-in-filtered-set.txt

hva-enum

• /pen/lin/discov-ad#shoot-priv-users
• /pen/lin/discov-ad#shoot-spns
• /pen/lin/discov-ad#shoot-uac

# credit hausec cypher query : hva
MATCH p=(n:User)-[r:MemberOf*1..]->(m:Group {highvalue:true}) RETURN p

# credit hausec cypher query : list users group

hva-confirm

# confirm admincount
pywerview get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --username $ztarg_user_next | grep admincount | awk '{print $2}' | paste -s -d, -

# confirm spn
pywerview get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --username $ztarg_user_next | grep serviceprincipalname | awk '{print $2}' | paste -s -d, -

# confirm uac
pywerview get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --username $user | grep useraccountcontrol | awk '{print $2}' | paste -s -d, -

UAC shortlist from Microsoft :

• ACCOUNTDISABLE
• DONT_EXPIRE_PASSWORD
• DONT_REQ_PREAUTH
• INTERDOMAIN_TRUST_ACCOUNT
• PASSWORD_EXPIRED
• PASSWD_NOTREQD
• SMARTCARD_REQUIRED
• TRUSTED_FOR_DELEGATION
• TRUSTED_TO_AUTH_FOR_DELEGATION

check-pwdlastset

pwdlastset-hva

# STEP 1: create a new dir
mkdir _hva; cd _hva
# SPTE 2: fill the txt with hva accounts
touch hva_accnt.txt
# STEP 3: get 1 getnetuser txt / hva accounts
for zhva_accnt in `cat hva_accnt.txt`; do pywerview.py get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass --dc-ip $zdom_dc_ip --username $zhva_accnt > $zcase"_getnetuser_"$zhva_accnt".txt"; done
# STEP 4: grep into the txt
grep pwdlastset *getnetuser* | sed 's/.*getnetuser_\(.*\)\.txt.*\([0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}\ [0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}.*[-+][0-9]\{2\}:[0-9]\{2\}\)/\2,\1/' | sort -u | csvlook -H

pwdlastset-bh-pwnable

• Extract JSON from BH prebuilt queries (Dangerous Privs, KRB interactions, SPF)
• Format the JSON to CSV :

  bh_query=pt_XXX_bh_dangerous-privs_dcsync
  cat $bh_query.json | jq -r '.spotlight[] | join(",")' > $bh_query.csv
  

bh-pwnable-users

for user in `grep -i user $bh_query".csv" | cut -f1 -d, | sed 's/\(.*\)\@.*$/\1/'`; 
  do pywerview get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --username $user | grep "samaccountname\|pwdlastset" | awk '{print $2}' | paste -s -d, -; 
done

bh-pwnable-groupmembers

# get the groups
while read line; do echo $line | grep -i group | cut -f1 -d, | sed 's/\(.*\)\@.*$/\1/'; done < $bh_query.csv >> groups.txt

# get the members
while read group;  do echo $group; pywerview get-netgroupmember -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip -r --groupname "$group" | grep "membername" | awk '{print $2}' >> members.txt ; done < groups.txt

# list pwdlastset
for member in `sort -u members.txt`; 
do pywerview get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --username $member | grep "samaccountname\|pwdlastset" | awk '{print $2}' | paste -s -d, -; done;

check-dacl

check-dacl-4-sam

# define the sam-account-name
ztarg_sam="Domain users"
ztarg_sam="Authenticated users"
ztarg_sam="DC01$"

# retrieve DACLs
pywerview get-objectacl -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass -t $zdom_dc_ip --sam-account-name $ztarg_sam --resolve-sids > $zcase"_dacl_XXX_resolved.txt"

# get the securityidentifier based on $ad_rights 
ad_rights="generic_all"
ad_rights="generic_write"
ad_rights="write_dacl"
ad_rights="write_property"
ad_rights="write_owner"
ad_rights="extended_right"

grep -A 7 -B 7 $ad_rights $zcase"_get-objectacl_"$ztarg_sam".txt" | awk '{  if ($1 ~ /objectdn/) {split($0,a,":"); od=a[2]} else if ($1 ~ /acetype/) {split($0,a,":"); at=a[2]} else if ($1 ~ /activedirectoryrights/) {split($0,a,":"); ar=a[2]} else if ($1 ~ /isinherited/) {split($0,a,":"); ii=a[2]} else if ($1 ~ /securityidentifier/) {split($0,a,":"); print at";"od";"a[2]";"ar";"ii}}'

check-dacl-all-with-aced

# execution
python3 ./aced.py $zz@$zdom_dc_ip

# check foreign principal
# local principal with samaccountname at 'none' might mean existing ACE for deleted object  
sid=""
pywerview.py get-netuser -w $zdom_fqdn -u $ztarg_user_name -p $ztarg_user_pass --dc-ip $zdom_dc_ip --custom-filter "(objectsid=$sid)"

check-dacl-all-with-bh.py

./bloodhound.py -c ACL --domain $zdom_fqdn -dc $zdom_dc_fqdn -u $ztarg_user_name -p $ztarg_user_pass
jq ...

check-gpo

bloodhood.py

./bloodhound.py -c Container --domain $zdom_fqdn -dc $zdom_dc_fqdn -u $ztarg_user_name -p $ztarg_user_pass

check-schema

# list confidential attributes
#Get-AdObject -SearchBase "CN=Schema,CN=Configuration,"$zdom_dn -LdapFilter '(&(searchflags:1.2.840.113556.1.4.804:=128)(!(searchflags:1.2.840.113556.1.4.804:=512)))'
#pywerview get-adobject -a "CN=Schema,CN=Configuration,"$zdom_dn --attribute searchflags

source: simondotsh.com.

check-gpo-whencreated

# jq-over-bh-json
cat 20230613111126_gpos.json | jq -r '.data[].Properties | {whencreated,name} |join (",")' |sort > 20230613111126_gpos.csv
EPOCH='1679537189'
date -d "1970-01-01 UTC $EPOCH seconds" +"%Y-%m-%d %T %z"

group3r

• github.com/Group3r)
• need to be compiled

check-replications

replication-analyzer

repadmin

netwrix account lockout examiner

take-ad-snapshot

check-ad-snapshot

adexplorersnapshot.py