djvu | 8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691

General

Target

8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
Size

695KB
MD5

999d1f23a3d2e1ba0668b7ed3317af30
SHA1

cc783775f56876c2b1af82f942fc3f3f4ed6ab37
SHA256

8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691
SHA512

53b9de37d9083e21ab5fb2ba5b8e57e1a62c7a31863507d356cd9ef98163279b26939562fb338b5709c44e1f3db1d5dcf66af8656b8b5b73db7be2d310a64cf9
SSDEEP

12288:38ffVfT7CXB5JOJRH0LflFV0jXtYLYL7fhImKBZmjSLiA3DtrFFk3:381ve5Je0zlFctZ/fVKBIjDATRk3

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

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

Attributes

extension
.held
offline_id
vyhLHcV0DMKjS0CgDoJGF0yJ299laBK7lZQM9Tt1
payload_url
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 18 IoCs

resource	yara_rule
behavioral2/memory/4396-1-0x00000000021D0000-0x00000000022EB000-memory.dmp	family_djvu
behavioral2/memory/3644-2-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3644-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3644-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3644-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3644-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-20-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-21-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-30-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1224-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu
Djvu family
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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2636	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-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\533d417b-22cf-4e03-8279-ec70a10aa87e\\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe\" --AutoStart"	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.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
6	api.2ip.ua
7	api.2ip.ua
21	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4396 set thread context of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4356 set thread context of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87

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	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
1224	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
1224	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 4396 wrote to memory of 3644	4396	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	83
PID 3644 wrote to memory of 2636	3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	84
PID 3644 wrote to memory of 2636	3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	84
PID 3644 wrote to memory of 2636	3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	84
PID 3644 wrote to memory of 4356	3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	85
PID 3644 wrote to memory of 4356	3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	85
PID 3644 wrote to memory of 4356	3644	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	85
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87
PID 4356 wrote to memory of 1224	4356	8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe	87

C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
"C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4396
- C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
  "C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.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:3644
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\533d417b-22cf-4e03-8279-ec70a10aa87e" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2636
- - C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
    "C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4356
  - - C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe
      "C:\Users\Admin\AppData\Local\Temp\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:1224

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
67e486b2f148a3fca863728242b6273e

SHA1
452a84c183d7ea5b7c015b597e94af8eef66d44a

SHA256
facaf1c3a4bf232abce19a2d534e495b0d3adc7dbe3797d336249aa6f70adcfb

SHA512
d3a37da3bb10a9736dc03e8b2b49baceef5d73c026e2077b8ebc1b786f2c9b2f807e0aa13a5866cf3b3cafd2bc506242ef139c423eaffb050bbb87773e53881e

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
de975b6d3115179bd6522f4acaa1d406

SHA1
27e46e99863c1234e32a7eb5b2722b37dd8240cb

SHA256
5467abf3b1b79daaf05a86e1c7d48f501f0c3bb1d4ec04ce38f8635286459544

SHA512
67f2ef05f03ff2dec13098f65394fc016131479eb3ebd201a131abf162e14420843d3d981040505219dffa383e597abd7017db49027f72e858cb9464d4a59a8b

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

Filesize
170B

MD5
a444538ec66edd733b2c87a998d64f1c

SHA1
3e186c5823e6595d2d045cdaa522bccdbc73af28

SHA256
f30d4087ca9377d6942c9eca89b3f5cd9d7a4ef72e1cf1c78b3c1eaa2c31be0a

SHA512
ef1bfb3c6846338aaeef371b3a843142d154c586217f4d3d2b7240dc104ad39e8798e45584ba9dae693cd4711023751a419cd186a3bc89f28548a675edbf1d02

Download Submit
C:\Users\Admin\AppData\Local\533d417b-22cf-4e03-8279-ec70a10aa87e\8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691N.exe

Filesize
695KB

MD5
999d1f23a3d2e1ba0668b7ed3317af30

SHA1
cc783775f56876c2b1af82f942fc3f3f4ed6ab37

SHA256
8452f9b899df6f5e6170738a1249551e7288af58bfccba239ddee41a3a629691

SHA512
53b9de37d9083e21ab5fb2ba5b8e57e1a62c7a31863507d356cd9ef98163279b26939562fb338b5709c44e1f3db1d5dcf66af8656b8b5b73db7be2d310a64cf9

Download Submit
memory/1224-30-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-31-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-33-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-29-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-20-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-21-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-28-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-36-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-37-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1224-38-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3644-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3644-17-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3644-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3644-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3644-2-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4356-22-0x0000000000400000-0x00000000004B4000-memory.dmp

Filesize
720KB

Download
memory/4356-18-0x0000000000400000-0x00000000004B4000-memory.dmp

Filesize
720KB

Download
memory/4396-0-0x0000000000630000-0x00000000006C2000-memory.dmp

Filesize
584KB

Download
memory/4396-5-0x0000000000630000-0x00000000006C2000-memory.dmp

Filesize
584KB

Download
memory/4396-1-0x00000000021D0000-0x00000000022EB000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads