djvu | 8ed183df76d08024f15e051f4f5711535dde6372ff4beafecfff07f82e846800

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
01/01/2024, 15:12

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General

Target
734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
Size 804KB
Sample240101-sladjafeg6
SHA256 734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d
MD5 3bf9acee0ccca5d14b24d3d148e9e77d
SHA1 e8f53145aad88480e9a055a4549aa5eaa631a51c
SHA512 0a5bdab9e3c2aaf835d2263f4658a5c0e5021eed402e976d0e7e89dab41416ba3cd5767980396d769d0f6a993d5f0ff3294dcdfc7189c45480ef7a366961a63e
SSDEEP 12288:miDzq+QQi5v6xH8HeYkqBeJEk3QgO92TWQunZxpFremjq8txlr:Hzq+Q3F6xHAJkEkAd9cuZfTO8Rr
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

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

Attributes

extension
.sato
offline_id
GdcTFG029NGZ36LGVnRuxctpZuCpnW1SW5kiOCt1
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
behavioral26/memory/4776-2-0x0000000002420000-0x000000000253B000-memory.dmp	family_djvu
behavioral26/memory/4424-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4424-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4424-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4424-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4424-15-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-21-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-20-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-47-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral26/memory/4708-51-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu
Downloads MZ/PE file

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-1-5-21-768304381-2824894965-3840216961-1000\Control Panel\International\Geo\Nation	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
Key value queried	\REGISTRY\USER\S-1-5-21-768304381-2824894965-3840216961-1000\Control Panel\International\Geo\Nation	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe

Executes dropped EXE 5 IoCs

pid	Process
3644	build3.exe
4272	build3.exe
4472	mstsca.exe
680	mstsca.exe
3420	mstsca.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1332	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-1-5-21-768304381-2824894965-3840216961-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\065cd7ca-dbc5-4b32-891a-3c61af542ecb\\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe\" --AutoStart"	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.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
4	api.2ip.ua
7	api.2ip.ua
30	api.2ip.ua

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4776 set thread context of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4816 set thread context of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 3644 set thread context of 4272	3644	build3.exe	109
PID 4472 set thread context of 680	4472	mstsca.exe	114

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2320	schtasks.exe
4008	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
4708	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
4708	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe

Suspicious use of WriteProcessMemory 53 IoCs

description	pid	Process	procid_target
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4776 wrote to memory of 4424	4776	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	31
PID 4424 wrote to memory of 1332	4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	64
PID 4424 wrote to memory of 1332	4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	64
PID 4424 wrote to memory of 1332	4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	64
PID 4424 wrote to memory of 4816	4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	66
PID 4424 wrote to memory of 4816	4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	66
PID 4424 wrote to memory of 4816	4424	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	66
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4816 wrote to memory of 4708	4816	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	76
PID 4708 wrote to memory of 3644	4708	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	98
PID 4708 wrote to memory of 3644	4708	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	98
PID 4708 wrote to memory of 3644	4708	734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe	98
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 3644 wrote to memory of 4272	3644	build3.exe	109
PID 4272 wrote to memory of 2320	4272	build3.exe	108
PID 4272 wrote to memory of 2320	4272	build3.exe	108
PID 4272 wrote to memory of 2320	4272	build3.exe	108
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 4472 wrote to memory of 680	4472	mstsca.exe	114
PID 680 wrote to memory of 4008	680	mstsca.exe	113
PID 680 wrote to memory of 4008	680	mstsca.exe	113
PID 680 wrote to memory of 4008	680	mstsca.exe	113

C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
"C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4776
- C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
  "C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4424
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\065cd7ca-dbc5-4b32-891a-3c61af542ecb" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:1332
- - C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
    "C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4816
  - - C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe
      "C:\Users\Admin\AppData\Local\Temp\734b9974ec7f673460deb7ae17af4eed0ad6fae862f0765068430050fc44d66d.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Checks computer location settings
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:4708
    - - C:\Users\Admin\AppData\Local\d47f5cb3-e9e2-4864-bbe9-84da08fbb51b\build3.exe
        
        "C:\Users\Admin\AppData\Local\d47f5cb3-e9e2-4864-bbe9-84da08fbb51b\build3.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:3644
      - C:\Users\Admin\AppData\Local\d47f5cb3-e9e2-4864-bbe9-84da08fbb51b\build3.exe
        
        "C:\Users\Admin\AppData\Local\d47f5cb3-e9e2-4864-bbe9-84da08fbb51b\build3.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of WriteProcessMemory
        
        PID:4272

C:\Windows\SysWOW64\schtasks.exe
/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
1⤵
- Creates scheduled task(s)
PID:2320

C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4472
- C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:680

C:\Windows\SysWOW64\schtasks.exe
/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
1⤵
- Creates scheduled task(s)
PID:4008

C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
1⤵
- Executes dropped EXE
PID:3420

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

mstsca.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
Size 299KB
SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
MD5 41b883a061c95e9b9cb17d4ca50de770
SHA1 1daf96ec21d53d9a4699cea9b4db08cda6fbb5ad
SHA512 cdd1bb3a36182575cd715a52815765161eeaa3849e72c1c2a9a4e84cc43af9f8ec4997e642702bb3de41f162d2e8fd8717f6f8302bba5306821ee4d155626319
SSDEEP 6144:2neDcgRQv5VaNT9DW7a6dtM9VstSttuvqIT:2O0v5VuT9DW7hdt9tKt2qI
MD5 SHA1 SHA512 SSDEEP

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mstsca.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
Size 155KB
SHA256 aaad2c09b68ece78bdff6948a26b3594c2ee9695bb345bad223bace50ceddc63
MD5 6f394bc0d2ad75027e0fdb48fb5496f6
SHA1 469a7614ab0b134edf60bc262665d170e9a8967a
SHA512 2e697094fa33b24f0314273b3045151e13ccc5162a4f34cf27641bf315cd05e1bc6e943acfb771653a68261a3fca2f528cc4f4d7d2e825df6816630ff61f4f69
SSDEEP 3072:2SNChBNpSjDp+UidGSXiFhzQZV5VaNLv9DW7dt2k:2neDcgRQv5VaNT9DW7ak
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/3644-59-0x0000000002300000-0x0000000002304000-memory.dmp

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memory/3644-58-0x000000000080D000-0x000000000081D000-memory.dmp

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memory/4272-63-0x0000000000410000-0x00000000004D9000-memory.dmp

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memory/4272-55-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/4272-60-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/4272-62-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/4424-15-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4424-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4424-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4424-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4424-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4472-75-0x0000000000B70000-0x0000000000C70000-memory.dmp

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memory/4708-51-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-47-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-20-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-21-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4708-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4776-2-0x0000000002420000-0x000000000253B000-memory.dmp

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memory/4776-1-0x0000000002220000-0x00000000022B7000-memory.dmp

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memory/4816-18-0x0000000002190000-0x0000000002229000-memory.dmp

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