djvu | 3b8d07693e296aee36e7607c71503d981396a21b367e169146afdd052cdcf4d1

General

Target

file.exe
Size

729KB
MD5

d7528cd33b73718b5949277420681f90
SHA1

61d97f8da20ff2995890ce5f2c8a2c9e6e51c078
SHA256

3b8d07693e296aee36e7607c71503d981396a21b367e169146afdd052cdcf4d1
SHA512

b3dab709e19a2a8bad92b259ea1739ad55564f6fe31e9f4e502b6280ae6c70cdf5a0f1fda208887da4bbcf9213986e2038abe6a09dc2940998df08d82e87d474
SSDEEP

12288:koywWrwlTyC9yR+xBP4wMpAuhjH8/Hl19KKjNgzqE0CM6EpJMwk:PlTX9Xj4w+hbM1/g2kM

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

http://cajgtus.com/test1/get.php

Attributes

extension
.watz
offline_id
Lc3VTezPWbMhuVAQFzJUdeA68PwI7UDpc5aKHYt1
payload_url
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 17 IoCs

resource	yara_rule
behavioral2/memory/4168-2-0x0000000002240000-0x000000000235B000-memory.dmp	family_djvu
behavioral2/memory/932-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/932-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/932-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/932-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/932-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-21-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-30-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-39-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3584-40-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

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

Checks computer location settings 2 TTPs 1 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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	file.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
3008	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-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\f70f890c-c25c-4eaf-b2d2-b4dd0931ff39\\file.exe\" --AutoStart"	file.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
18	api.2ip.ua
19	api.2ip.ua
24	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4168 set thread context of 932	4168	file.exe	86
PID 4592 set thread context of 3584	4592	file.exe	90

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	file.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	file.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	file.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	file.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
932	file.exe
932	file.exe
3584	file.exe
3584	file.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 4168 wrote to memory of 932	4168	file.exe	86
PID 932 wrote to memory of 3008	932	file.exe	87
PID 932 wrote to memory of 3008	932	file.exe	87
PID 932 wrote to memory of 3008	932	file.exe	87
PID 932 wrote to memory of 4592	932	file.exe	88
PID 932 wrote to memory of 4592	932	file.exe	88
PID 932 wrote to memory of 4592	932	file.exe	88
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90
PID 4592 wrote to memory of 3584	4592	file.exe	90

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4168
- C:\Users\Admin\AppData\Local\Temp\file.exe
  "C:\Users\Admin\AppData\Local\Temp\file.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:932
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\f70f890c-c25c-4eaf-b2d2-b4dd0931ff39" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:3008
- - C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4592
  - - C:\Users\Admin\AppData\Local\Temp\file.exe
      "C:\Users\Admin\AppData\Local\Temp\file.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:3584

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

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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
9df454429b04b130bfa1b74f6565c8e4

SHA1
0d3ab58db37c483d6f0825e6a0f7acc1f09b9f61

SHA256
86966bb95740e3088920de8318e4a7d397e40649d1cbb0d14eea189a22e0960d

SHA512
5a0e939b090f4e4e8e4b39db2728ce172ee25cf6109e3dbc22b63e9d07ca25b612242edb8968dc38fb83742453bf025ed0d527a8930dc6773b8d82f888bff64e

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

Filesize
170B

MD5
e46c94a2a04b40ce158ab0fd2aaed80e

SHA1
3bfbba3ea07f70447ff7849ad6fa2ff3f825f588

SHA256
d7bbed451793dc7374de96451e221a60de5f3e4b3dd0cabfa0c26dbe7141b711

SHA512
8fa86c62f9ca10bde05c6c3af9a29e17502712e0efde892e45fbd4beac60db0126ac3a84385b48345fb5edeb1886c81e957e23f0811fd8f6f59ef8a9e7344286

Download Submit
C:\Users\Admin\AppData\Local\f70f890c-c25c-4eaf-b2d2-b4dd0931ff39\file.exe

Filesize
729KB

MD5
d7528cd33b73718b5949277420681f90

SHA1
61d97f8da20ff2995890ce5f2c8a2c9e6e51c078

SHA256
3b8d07693e296aee36e7607c71503d981396a21b367e169146afdd052cdcf4d1

SHA512
b3dab709e19a2a8bad92b259ea1739ad55564f6fe31e9f4e502b6280ae6c70cdf5a0f1fda208887da4bbcf9213986e2038abe6a09dc2940998df08d82e87d474

Download Submit
memory/932-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/932-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/932-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/932-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/932-17-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-29-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-40-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-39-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-21-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-38-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-37-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-24-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-30-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-31-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3584-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4168-2-0x0000000002240000-0x000000000235B000-memory.dmp

Filesize
1.1MB

Download
memory/4168-1-0x00000000021A0000-0x0000000002237000-memory.dmp

Filesize
604KB

Download
memory/4592-19-0x0000000000400000-0x00000000004CA000-memory.dmp

Filesize
808KB

Download
memory/4592-23-0x0000000000400000-0x00000000004CA000-memory.dmp

Filesize
808KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads