IndigoDrop Trojan

IndigoDrop is a modular dropper trojan used in sophisticated campaigns against governmental, financial, and military organisations worldwide. It was first identified in the wild in September 2019, although it is believed to have been used in earlier attacks.

Campaigns using IndigoDrop typically begin with delivery of a malicious macro-laden Office document. Some campaigns use externally linked template documents that call out to an attacker-controlled domain to download the macros.

When opened, the macros will parse embedded data containing IndigoDrop into an EXE file before writing it to the user’s Startup directory. When the user logs back in, the EXE is launched.

Once installed, IndigoDrop will edit the Run registry key to establish persistence before performing a number of anti-infection checks. If these checks pass it then downloads and executes a Metasploit shell code script from a public text storage site.

This script acts as a reverse HTTP stager to download a jQuery file from a specific command and control server, where it is then executed by IndigoDrop to decode and install the intended final payload. At the time of publication, IndigoDrop has only been observed delivering trojanised variants of the Cobalt Strike penetration testing tool.

Indicators Of Compromise (IOCs)

The following IOCs are related to this threat.

MALDOC HASHES

7a5b645a6ea07f1420758515661051cff71cdb34d2df25de6a62ceb15896a1b6
b11dbaf0dd37dd4079bfdb0c6246e53bc75b25b3a260c380bb92fcaec30ec89b
aeb38a11ffc62ead9cdabba1e6aa5fce28502a361725f69586c70e16de70df2c
71c88a59b16dbcf7f061d01ea2015658136a8d4af60beb01caa94eeb74c733cd
ab209db9694a3b69427fc5857a8a47d0822db4d8372434fc091dfc3e85510719
4a6990be2d43f482fe2ab377b5e798da47ba7e02f23dfb6dba26b5011e222d25
7deeb35d7e88b769d286cc7892ee5966a27c39f03c8ac12dec21733faeffa350

DROPPER HASHES
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PYTHON MODULE EXES

3aa06700a22808978744aa83d9e084c358517f60525c89236f142b7aa2ce0bef
85e69341f2fe9b97cf0bc81dc63917e62bb17072bcd20fc6125d241623e68660
3066e859109397180c63797c4b779633569ac0c88b54c7cf73752f7895f39629
4260de850b4003c9d4663afea00ba57ec02761f687dba1117ded0a8b20c6b5bb
a657bb83fe62e4b555d20463bf090f3349e55e1560507f2197a42c2c3f152667
ce438b0d30dd1c221e3c7ab99585acb4254deaf68bdfb8fc73eb206d8fd04771

COBALT STRIKE BEACON HASHES

482858b70888acf67a5c2d30ddee61ca7b57ff856feaad9a2fa2b5d4bc0bbd7d
689f7d3f0def72248c4ff4b30da5022ec808a20e99b139e097c2a0d0ba5bab66
dbb5bba499e0ab07e545055d46acf3f78b5ed35fff83d9c88ce57c6455c02091
e37a0b4145f22ce7f7478918320c019a6014060cb033aafec18a8d130c4c426b
4b0c2f790c7b9c84517648bb36964c859629736dab1fa5466d91bd23f69c9b55
c2d9bbd5163a8e733483bf5d0d4959f053a2307d275b81eb38e69d87f1f5df7e
a0cfec815cb74a7671265fd5e0790a2a79c05fe0ef16d2d0c87584049d06658b

MALICIOUS JQUERY FILES CONTAINING THE BEACONS

1ea22d132c1d478347d7e4e72d79bae29f18df9bec5a3016a5a9971f702a8095
b9efca96d451c0b4028b6081456c1ddd3035ab39e6a60bdd831bcf4a472a31ae
b081b818e5fbd5d2741822c9e161e536a8497764fab5ac79143614bbce8308f6
d2fd448a386416fdad0059be1bb61f49e99fc76e7efbd5f5e377dbbf6e7e3599
bdbc9dc2f2812a9808357aafe908e7206c9168bc7fea761dec871926de23eec0

MALDOC DISTRIBUTION URLS

hxxp://bit[.]ly/iaf-guidelines
hxxp://tecbeck[.]com/IAP39031[.]docx
hxxp://bitly[.]com/38A5BEO

COBALT STRIKE BEACON CNC URLS

hxxp://134[.]209.196.51/jquery-3.3.1.min.js
hxxp://134[.]209.196.51/jquery-3.3.2.min.js
hxxp://139[.]59.1.154/ca
hxxp://139[.]59.1.154/submit.php
hxxp://139[.]59.79.105/jquery-3.3.1.min.js
hxxp://139[.]59.79.105/jquery-3.3.2.min.js
hxxp://188[.]166.14.73/jquery-3.3.1.min.js
hxxp://188[.]166.14.73/jquery-3.3.2.min.js

IP ADDRESSES

134[.]209.196.51
134[.]209.200.91
139[.]59.1.154
139[.]59.79.105
139[.]59.81.167
157[.]245.78.153
165[.]22.201.190
178[.]62.210.85
188[.]166.14.73
188[.]166.25.156
202[.]59.79.131

MSF SHELLCODE URLS

hxxp://139[.]59.1.154:8201/cmelkmkl.txt
hxxp://157[.]245.78.153/11.txt
hxxp://157[.]245.78.153/12.txt
hxxp://157[.]245.78.153/21.txt
hxxp://157[.]245.78.153/22.txt
hxxp://157[.]245.78.153/31.txt
hxxp://157[.]245.78.153/32.txt
hxxp://157[.]245.78.153/41.txt
hxxp://157[.]245.78.153/42.txt
hxxp://157[.]245.78.153/51.txt
hxxp://157[.]245.78.153/52.txt
hxxp://202[.]59.79.131/7XyT
hxxp://202[.]59.79.131/o2Q7NGUwpFfDzcLMnkuMyAy-IGt8KERPl-6lrRhxcbPJkZwAr33
hxxp://202[.]59.79.131:8080/8g-QvDrvM4hSI0c3D6iC8Aib6wZbs

JQUERY/DECODER SHELLCODE URLS

hxxp://134[.]209.196.51/jquery-3.3.0.min.js
hxxp://134[.]209.200.91/jquery-3.3.0.min.js
hxxp://139[.]59.1.154/ToKN
hxxp://139[.]59.79.105/jquery-3.3.0.min.js
hxxp://139[.]59.81.167/jquery-3.3.0.min.js
hxxp://165[.]22.201.190/jquery-3.3.0.min.js
hxxp://188[.]166.14.73/jquery-3.3.0.min.js
hxxp://188[.]166.25.156/jquery-3.3.0.min.js
hxxp://202[.]59.79.131/YZn_pcfLiUILewp6Vuku9gvUqfMFnPLBP5Aju9QS709n4zRAd-3e4IuPF5kv0uhXSAiJqurq5yPJ-B9zSZ5rHig07RcWcQPIPD04YZhq1JCGWwYI-AfFFHI0qj4LRDhsuaBdQEihGmxzZ8obxUbv5RUfaxm7XwOkWJK8D9xK5gibPGGBiNs41hYB0Kar325FCcCJAIFIzWOw9WLOt6EfrWaEO69aHp

MSF SHELLCODE PASTEBIN URLS

hxxps://pastebin[.]com/raw/zT57Pkzj
hxxps://pastebin[.]com/raw/kf3y5uzt
hxxps://pastebin[.]com/raw/ftfSHyPz
hxxps://pastebin[.]com/raw/hAKzruWe
hxxps://hastebin[.]com/raw/ufaxamogav
hxxps://pastebin[.]com/raw/KzmUrrnB
hxxps://pastebin[.]com/raw/aMfFtqjq
hxxps://pastebin[.]com/raw/Q6bMcduX
hxxps://pastebin[.]com/raw/7VmV7jXA
hxxps://pastebin[.]com/raw/8E8YCryu
hxxps://pastebin[.]com/raw/1tKX0v5U
hxxps://pastebin[.]com/raw/kpn2k1jc
hxxps://pastebin[.]com/raw/xiV89Xa9
hxxps://pastebin[.]com/raw/ZMTjGJUn
hxxps://pastebin[.]com/raw/CRuQvJk1
hxxps://pastebin[.]com/raw/zbL0w8sm
hxxps://pastebin[.]com/raw/yP7eQKsv
hxxps://pastebin[.]com/raw/1Q7jYDmz
hxxps://pastebin[.]com/raw/vc8TUZPN
hxxps://pastebin[.]com/raw/R0HzuGWE
hxxps://pastebin[.]com/raw/ehQyY1YX
hxxps://pastebin[.]com/raw/LRztjgkq
hxxps://pastebin[.]com/raw/QyDZhfer
hxxps://pastebin[.]com/raw/MQUG0Q07
hxxps://pastebin[.]com/raw/LtVteHbz
hxxps://pastebin[.]com/raw/k2PQZqzF
hxxps://pastebin[.]com/raw/azzHZ11B
hxxps://pastebin[.]com/raw/4u1ScSn7
hxxps://pastebin[.]com/raw/5tSnVWcn
hxxps://pastebin[.]com/raw/a0kPq7bq
hxxps://pastebin[.]com/raw/cK8nhTYw
hxxps://pastebin[.]com/raw/p34D4vbL
hxxps://pastebin[.]com/raw/YVvG43bi
hxxps://pastebin[.]com/raw/iyKjw7jR
hxxps://pastebin[.]com/raw/0hAzfmrR
hxxps://pastebin[.]com/raw/aGSg1f3Y
hxxps://pastebin[.]com/raw/i5JkU138
hxxps://pastebin[.]com/raw/LQjs18Cy
hxxps://pastebin[.]com/raw/rHeWv7t0
hxxps://pastebin[.]com/raw/bqL6CSp3
hxxps://pastebin[.]com/raw/WJFvRHXv

IndigoDrop’s anti-infection checks

USERNAMES BLOCKED

admin
8a3YwFo8xYlc
iBqxaDRj5T
dPNNfpR
fnIcszErnay
y9NzUJ
0sNBuzz63Nl8
ZJsji0QShXfiM
3ALPeOppOKOEk
C4EZdigYE64r
0M7vKY
6oVAnp
A0T6Z0j1NFrrQ
Johnson
Olivia
Vh2ij
5Li9Ls
yMBCh9wwy
FWpuxsyMQZZNW
Admin
Lisa
QYbRCr
TyLbns
H0USlDC58dVLE
RmJCA
Administrator_

COMPUTER NAMES BLOCKED

user-pc
8a3YwFo8xYlc-PC
iBqxaDRj5T-PC
dPNNfpR-PC
fnIcszErnay-PC
y9NzUJ-PC
0sNBuzz63Nl8-PC
AVN671124898447
GXKKQO724201067
art-PC
C4EZdigYE64r-PC
0M7vKY-PC
6oVAnp-PC
TFT153265618011
AXWF10479288957
Johnson-PC
Desktop-HRW10
Vh2ij-PC
5Li9Ls-PC
yMBCh9wwy-PC
PGHFTIGN5920348
CPCTBGSA2018901
ADMINIS-HJ9SRP3
Lisa-PC
QYbRCr-PC
TyLbns-PC
SESW54921970303
RmJCA-PC

IMMEDIATE PARENT FOLDER NAMES BLOCKED

Downloads
mydownload
Desktop
system32
Temp

MAC ADDRESSES BLOCKED

00[:]07:e9:e4:ce:4d
60[:]02:92:e5:2f:30
60[:]02:92:77:fc:94
52[:]54:00:12:34:56
08[:]00:27:55:12:e3
60[:]02:92:89:76:36
00[:]00:00:00:00:00:00:e0

IP ADDRESSES BLOCKED

51[.]68.93.185
79[.]104.209.156
89[.]208.29.214
95[.]25.130.162
51[.]15.76.60
62[.]102.148.68
207[.]102.138.40
51[.]83.15.56
109[.]70.100.24
109[.]70.100.29
128[.]90.148.185
78[.]142.19.43
46[.]165.254.166
221[.]191.21.11
153[.]201.39.205
92[.]211.106.185
51[.]68.91.152
89[.]208.29.215
185[.]220.101.35
95[.]26.100.11