djvu | f5928b4b67f399e11ece2de04588730b5891105ab72add45c7a9ff1fc3d961b7

Analysis

max time kernel
71s
max time network
133s
platform
windows10_x64
resource
win10v20210408
submitted
26/09/2021, 06:50

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General

Target
dc42dd95ce4017c9984f759a77788bec.exe
Size 666KB
Sample210926-hlxtqaeddq
SHA256 f5928b4b67f399e11ece2de04588730b5891105ab72add45c7a9ff1fc3d961b7
MD5 dc42dd95ce4017c9984f759a77788bec
SHA1 f4d4796f4d49138a4cafa8a86a47db14ae322dbc
SHA512 e921375e5a67157061c3efaca92ca887e258a47f487bc9de356d8dd2a19ddca81f698266538a623421677953568fd05e91f1c7bce965e11a948894f9a4864938
MD5 SHA1 SHA512

Score

10^/10

djvu vidar discovery persistence ransomware spyware stealer suricata

Malware Config

Signatures

Detected Djvu ransomware 6 IoCs

resource	yara_rule
behavioral2/memory/888-115-0x0000000000424141-mapping.dmp	family_djvu
behavioral2/memory/888-114-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/900-116-0x0000000002330000-0x000000000244B000-memory.dmp	family_djvu
behavioral2/memory/888-117-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1884-122-0x0000000000424141-mapping.dmp	family_djvu
behavioral2/memory/1884-127-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata

Vidar Stealer 4 IoCs

stealer

resource	yara_rule
behavioral2/memory/2528-131-0x0000000002E80000-0x0000000002F54000-memory.dmp	family_vidar
behavioral2/memory/2724-133-0x00000000004A032D-mapping.dmp	family_vidar
behavioral2/memory/2724-132-0x0000000000400000-0x00000000004D7000-memory.dmp	family_vidar
behavioral2/memory/2724-135-0x0000000000400000-0x00000000004D7000-memory.dmp	family_vidar

Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
2528	build2.exe
2724	build2.exe

Loads dropped DLL 2 IoCs

pid	Process
2724	build2.exe
2724	build2.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1320	icacls.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses 2FA software files, possible credential harvesting 2 TTPs
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\60c76d5b-3cf3-47f6-ad73-6955b19e7ee5\\dc42dd95ce4017c9984f759a77788bec.exe\" --AutoStart"	dc42dd95ce4017c9984f759a77788bec.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

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
1	api.2ip.ua
2	api.2ip.ua
9	api.2ip.ua

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 900 set thread context of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 1428 set thread context of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 2528 set thread context of 2724	2528	build2.exe	74

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	build2.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	build2.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3872	timeout.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2628	taskkill.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349	dc42dd95ce4017c9984f759a77788bec.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 5c000000010000000400000000080000090000000100000054000000305206082b0601050507030206082b06010505070303060a2b0601040182370a030406082b0601050507030406082b0601050507030606082b0601050507030706082b0601050507030106082b0601050507030853000000010000004300000030413022060c2b06010401b231010201050130123010060a2b0601040182373c0101030200c0301b060567810c010330123010060a2b0601040182373c0101030200c0620000000100000020000000d7a7a0fb5d7e2731d771e9484ebcdef71d5f0c3e0a2948782bc83ee0ea699ef40b000000010000001c0000005300650063007400690067006f002000280041004100410029000000140000000100000014000000a0110a233e96f107ece2af29ef82a57fd030a4b41d00000001000000100000002e0d6875874a44c820912e85e964cfdb030000000100000014000000d1eb23a46d17d68fd92564c2f1f1601764d8e349200000000100000036040000308204323082031aa003020102020101300d06092a864886f70d0101050500307b310b3009060355040613024742311b301906035504080c1247726561746572204d616e636865737465723110300e06035504070c0753616c666f7264311a3018060355040a0c11436f6d6f646f204341204c696d697465643121301f06035504030c18414141204365727469666963617465205365727669636573301e170d3034303130313030303030305a170d3238313233313233353935395a307b310b3009060355040613024742311b301906035504080c1247726561746572204d616e636865737465723110300e06035504070c0753616c666f7264311a3018060355040a0c11436f6d6f646f204341204c696d697465643121301f06035504030c1841414120436572746966696361746520536572766963657330820122300d06092a864886f70d01010105000382010f003082010a0282010100be409df46ee1ea76871c4d45448ebe46c883069dc12afe181f8ee402faf3ab5d508a16310b9a06d0c57022cd492d5463ccb66e68460b53eacb4c24c0bc724eeaf115aef4549a120ac37ab23360e2da8955f32258f3dedccfef8386a28c944f9f68f29890468427c776bfe3cc352c8b5e07646582c048b0a891f9619f762050a891c766b5eb78620356f08a1a13ea31a31ea099fd38f6f62732586f07f56bb8fb142bafb7aaccd6635f738cda0599a838a8cb17783651ace99ef4783a8dcf0fd942e2980cab2f9f0e01deef9f9949f12ddfac744d1b98b547c5e529d1f99018c7629cbe83c7267b3e8a25c7c0dd9de6356810209d8fd8ded2c3849c0d5ee82fc90203010001a381c03081bd301d0603551d0e04160414a0110a233e96f107ece2af29ef82a57fd030a4b4300e0603551d0f0101ff040403020106300f0603551d130101ff040530030101ff307b0603551d1f047430723038a036a0348632687474703a2f2f63726c2e636f6d6f646f63612e636f6d2f414141436572746966696361746553657276696365732e63726c3036a034a0328630687474703a2f2f63726c2e636f6d6f646f2e6e65742f414141436572746966696361746553657276696365732e63726c300d06092a864886f70d010105050003820101000856fc02f09be8ffa4fad67bc64480ce4fc4c5f60058cca6b6bc1449680476e8e6ee5dec020f60d68d50184f264e01e3e6b0a5eebfbc745441bffdfc12b8c74f5af48960057f60b7054af3f6f1c2bfc4b97486b62d7d6bccd2f346dd2fc6e06ac3c334032c7d96dd5ac20ea70a99c1058bab0c2ff35c3acf6c37550987de53406c58effcb6ab656e04f61bdc3ce05a15c69ed9f15948302165036cece92173ec9b03a1e037ada015188ffaba02cea72ca910132cd4e50826ab229760f8905e74d4a29a53bdf2a968e0a26ec2d76cb1a30f9ebfeb68e756f2aef2e32b383a0981b56b85d7be2ded3f1ab7b263e2f5622c82d46a004150f139839f95e93696986e	dc42dd95ce4017c9984f759a77788bec.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
888	dc42dd95ce4017c9984f759a77788bec.exe
888	dc42dd95ce4017c9984f759a77788bec.exe
1884	dc42dd95ce4017c9984f759a77788bec.exe
1884	dc42dd95ce4017c9984f759a77788bec.exe
2724	build2.exe
2724	build2.exe
2724	build2.exe
2724	build2.exe
2724	build2.exe
2724	build2.exe
2724	build2.exe
2724	build2.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2628	taskkill.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 900 wrote to memory of 888	900	dc42dd95ce4017c9984f759a77788bec.exe	68
PID 888 wrote to memory of 1320	888	dc42dd95ce4017c9984f759a77788bec.exe	69
PID 888 wrote to memory of 1320	888	dc42dd95ce4017c9984f759a77788bec.exe	69
PID 888 wrote to memory of 1320	888	dc42dd95ce4017c9984f759a77788bec.exe	69
PID 888 wrote to memory of 1428	888	dc42dd95ce4017c9984f759a77788bec.exe	70
PID 888 wrote to memory of 1428	888	dc42dd95ce4017c9984f759a77788bec.exe	70
PID 888 wrote to memory of 1428	888	dc42dd95ce4017c9984f759a77788bec.exe	70
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1428 wrote to memory of 1884	1428	dc42dd95ce4017c9984f759a77788bec.exe	72
PID 1884 wrote to memory of 2528	1884	dc42dd95ce4017c9984f759a77788bec.exe	73
PID 1884 wrote to memory of 2528	1884	dc42dd95ce4017c9984f759a77788bec.exe	73
PID 1884 wrote to memory of 2528	1884	dc42dd95ce4017c9984f759a77788bec.exe	73
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2528 wrote to memory of 2724	2528	build2.exe	74
PID 2724 wrote to memory of 3268	2724	build2.exe	77
PID 2724 wrote to memory of 3268	2724	build2.exe	77
PID 2724 wrote to memory of 3268	2724	build2.exe	77
PID 3268 wrote to memory of 2628	3268	cmd.exe	79
PID 3268 wrote to memory of 2628	3268	cmd.exe	79
PID 3268 wrote to memory of 2628	3268	cmd.exe	79
PID 3268 wrote to memory of 3872	3268	cmd.exe	80
PID 3268 wrote to memory of 3872	3268	cmd.exe	80
PID 3268 wrote to memory of 3872	3268	cmd.exe	80

C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe
"C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:900
- C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe
  "C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe"
  2⤵
  - Adds Run key to start application
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:888
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\60c76d5b-3cf3-47f6-ad73-6955b19e7ee5" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:1320
- - C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe
    "C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1428
  - - C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe
      "C:\Users\Admin\AppData\Local\Temp\dc42dd95ce4017c9984f759a77788bec.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:1884
    - - C:\Users\Admin\AppData\Local\1099ca2e-f49d-47fe-85f9-486a11cba8d9\build2.exe
        
        "C:\Users\Admin\AppData\Local\1099ca2e-f49d-47fe-85f9-486a11cba8d9\build2.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:2528
      - C:\Users\Admin\AppData\Local\1099ca2e-f49d-47fe-85f9-486a11cba8d9\build2.exe
        
        "C:\Users\Admin\AppData\Local\1099ca2e-f49d-47fe-85f9-486a11cba8d9\build2.exe"
        6⤵
        Executes dropped EXE
        Loads dropped DLL
        Checks processor information in registry
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:2724
        
        C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\1099ca2e-f49d-47fe-85f9-486a11cba8d9\build2.exe" & del C:\ProgramData\*.dll & exit
        7⤵
        Suspicious use of WriteProcessMemory
        
        PID:3268
        
        C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im build2.exe /f
        8⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2628
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout /t 6
        8⤵
        Delays execution with timeout.exe
        
        PID:3872

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Install Root Certificate

T1130

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/888-117-0x0000000000400000-0x0000000000537000-memory.dmp

Download

memory/888-114-0x0000000000400000-0x0000000000537000-memory.dmp

Download

memory/900-116-0x0000000002330000-0x000000000244B000-memory.dmp

Download

memory/1884-127-0x0000000000400000-0x0000000000537000-memory.dmp

Download

memory/2528-131-0x0000000002E80000-0x0000000002F54000-memory.dmp

Download

memory/2724-135-0x0000000000400000-0x00000000004D7000-memory.dmp

Download

memory/2724-132-0x0000000000400000-0x00000000004D7000-memory.dmp

Download