djvu | b61fbbd592f750f0b85f955d69321b9eef03aa41e4bb8cc08562ff6f38ad38f0

General

Target

rti6787.exe
Size

741KB
MD5

0bc725a9a3a6bc0b8ed8da5713f6fbaa
SHA1

09ca298f60578c1a565d3c17773fc3f9bdb448bb
SHA256

b61fbbd592f750f0b85f955d69321b9eef03aa41e4bb8cc08562ff6f38ad38f0
SHA512

d5be08f18b27efb20e8789707ee81edcb6e1d81c6acd1a6bc28369d37b54dae9c573a5fdc3c0920a5e5436ff5309bd3bf890cfc8f5711d12bb24d3d645df9f88
SSDEEP

12288:3hY4wbycjZnwcy3Otc38OSNMt3QEXxaEbRu8MK+MjDpaOFx:3hY3WcjZPy3F8T6VbR3f+MjDEOFx

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

http://zexeq.com/raud/get.php

Attributes

extension
.coza
offline_id
O8Ao46dcCReRPC4I1PGMYsRFFc9WI5eOp0O3MFt1
payload_url
http://colisumy.com/dl/build2.exe

http://zexeq.com/files/1/build3.exe
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 16 IoCs

resource	yara_rule
behavioral2/memory/3684-2-0x0000000004AC0000-0x0000000004BDB000-memory.dmp	family_djvu
behavioral2/memory/2476-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2476-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2476-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2476-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2476-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-43-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-55-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-61-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-64-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-63-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-65-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/792-67-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	rti6787.exe
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	rti6787.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
4996	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\bb9368fb-f9ad-4729-af22-a7f369b3c7be\\rti6787.exe\" --AutoStart"	rti6787.exe

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
3	api.2ip.ua
4	api.2ip.ua
12	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3684 set thread context of 2476	3684	rti6787.exe	86
PID 2968 set thread context of 792	2968	rti6787.exe	91

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rti6787.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2476	rti6787.exe
2476	rti6787.exe
792	rti6787.exe
792	rti6787.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 3684 wrote to memory of 2476	3684	rti6787.exe	86
PID 2476 wrote to memory of 4996	2476	rti6787.exe	88
PID 2476 wrote to memory of 4996	2476	rti6787.exe	88
PID 2476 wrote to memory of 4996	2476	rti6787.exe	88
PID 2476 wrote to memory of 2968	2476	rti6787.exe	89
PID 2476 wrote to memory of 2968	2476	rti6787.exe	89
PID 2476 wrote to memory of 2968	2476	rti6787.exe	89
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91
PID 2968 wrote to memory of 792	2968	rti6787.exe	91

C:\Users\Admin\AppData\Local\Temp\rti6787.exe
"C:\Users\Admin\AppData\Local\Temp\rti6787.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3684
- C:\Users\Admin\AppData\Local\Temp\rti6787.exe
  "C:\Users\Admin\AppData\Local\Temp\rti6787.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2476
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\bb9368fb-f9ad-4729-af22-a7f369b3c7be" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:4996
- - C:\Users\Admin\AppData\Local\Temp\rti6787.exe
    "C:\Users\Admin\AppData\Local\Temp\rti6787.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2968
  - - C:\Users\Admin\AppData\Local\Temp\rti6787.exe
      "C:\Users\Admin\AppData\Local\Temp\rti6787.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Checks computer location settings
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:792

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
1KB

MD5
7fb5fa1534dcf77f2125b2403b30a0ee

SHA1
365d96812a69ac0a4611ea4b70a3f306576cc3ea

SHA256
33a39e9ec2133230533a686ec43760026e014a3828c703707acbc150fe40fd6f

SHA512
a9279fd60505a1bfeef6fb07834cad0fd5be02fd405573fc1a5f59b991e9f88f5e81c32fe910f69bdc6585e71f02559895149eaf49c25b8ff955459fd60c0d2e

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B46811C17859FFB409CF0E904A4AA8F8

Filesize
436B

MD5
971c514f84bba0785f80aa1c23edfd79

SHA1
732acea710a87530c6b08ecdf32a110d254a54c8

SHA256
f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895

SHA512
43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
174B

MD5
74e5457571e34c1d2041e10f19e03abb

SHA1
581519576bd450cbf41abe416993644ab5c1c60e

SHA256
7db0c4ad24fd25f7bd97d93d8a48bfef03f60ac4c1ee25686fffe6fef096ce1f

SHA512
b57029609a3df155993b05d83cf0b0d7d649a55770c248f0b53a3c2543e005c7a12473a3b108a7cc0650cc44e40b5d3439fa88563b5ca32908eef1abd18e51ff

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8

Filesize
170B

MD5
be1d356cf2a22060ff84f1bac48818ce

SHA1
d6d7b43b3ce1888e9ed4323149132ca1363169b6

SHA256
70f9c450011cd1adf7f2959491e5ef3cdc327ad3d34b9bd06d6d1632e522492d

SHA512
3957fa21b52e91637ca9c1199c1059810225bfa9fa1ae59ac2ff2d65d2d4dff8edb0081c6fe7dddb78e755efe53283c092f03cb28a654eaf5054d31e472a48eb

Download Submit
C:\Users\Admin\AppData\Local\bb9368fb-f9ad-4729-af22-a7f369b3c7be\rti6787.exe

Filesize
741KB

MD5
0bc725a9a3a6bc0b8ed8da5713f6fbaa

SHA1
09ca298f60578c1a565d3c17773fc3f9bdb448bb

SHA256
b61fbbd592f750f0b85f955d69321b9eef03aa41e4bb8cc08562ff6f38ad38f0

SHA512
d5be08f18b27efb20e8789707ee81edcb6e1d81c6acd1a6bc28369d37b54dae9c573a5fdc3c0920a5e5436ff5309bd3bf890cfc8f5711d12bb24d3d645df9f88

Download Submit
C:\Users\Admin\AppData\Local\bddfc3dd-6f25-43ae-82bc-8eef93f92b07\build3.exe

Filesize
437B

MD5
6910426a598bc0b07dd6ca7c2faf5c22

SHA1
4304d65a08652b167453997e1464cc6ef034be23

SHA256
ebfef207462c29030b8a06068c8cbf1cfeae1304813b9cdbfa2d705b314bf692

SHA512
5e96757fa5daa336968aa07d5fe5525040a081a547dd6bad55bed4539ad76b3f96aabd38f461efdafa4a427963b2a3187cc40dfa60c74e6c6ddf738176381952

Download Submit
C:\Users\Admin\AppData\Local\bowsakkdestx.txt

Filesize
449B

MD5
caa078f0348cda98328127c142e3bfed

SHA1
e38274d642c806a3affcca8f7e37b61f591c47e6

SHA256
91faeb982f34313750a83d74c5464abe4e01357d1a7ea4253973509bc0e9d219

SHA512
2e6a5c482b5226079c6b4bd9a706537c372a3b43962f64be6bdd281e3217f963316ef0eba38164890bdf14af6558eb26605320487f0a0c841be9bb813c2ee5d6

Download Submit
memory/792-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-64-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-67-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-65-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-63-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-61-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-28-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-55-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/792-43-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2476-19-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2476-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2476-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2476-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2476-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3684-1-0x0000000004A20000-0x0000000004AB2000-memory.dmp

Filesize
584KB

Download
memory/3684-2-0x0000000004AC0000-0x0000000004BDB000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads