eef74eb03d58c207f8314f31c0b1dc4535ad85389c4ace48592ab0678fc9f603

Analysis

max time kernel
150s
max time network
133s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
13-10-2023 20:37

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General

Target

2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe
Size

12.1MB
MD5

ffd6f7ea3d2f4b6fc78c583456dc0427
SHA1

d00e5a29f26e2127b4a0a59a84a5010ab2b721cb
SHA256

eef74eb03d58c207f8314f31c0b1dc4535ad85389c4ace48592ab0678fc9f603
SHA512

42ac759182241e9ada2ec40f2a1b25e8ca8967313647ffc3a41ea83b0395c0c8301c370ca0e4af98158bbba3e0bda4ecbccafe31d264dfb08d6773c27174fb10
SSDEEP

98304:9E2RpMMHMMMvMMZMMMlmMMMiMMMYJMMHMMM6MMZMMMqNMMzMMMUMMVMMMYJMMzM1:9n6n6r

Score

10^/10

persistence ransomware

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe HelpMe.exe"	HelpMe.exe

Renames multiple (93) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk	HelpMe.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk	HelpMe.exe

Executes dropped EXE 1 IoCs

pid	Process
2176	HelpMe.exe

Loads dropped DLL 2 IoCs

pid	Process
2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe
2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\Q:	HelpMe.exe
File opened (read-only)	\??\I:	HelpMe.exe
File opened (read-only)	\??\P:	HelpMe.exe
File opened (read-only)	\??\R:	HelpMe.exe
File opened (read-only)	\??\S:	HelpMe.exe
File opened (read-only)	\??\W:	HelpMe.exe
File opened (read-only)	\??\Y:	HelpMe.exe
File opened (read-only)	\??\L:	HelpMe.exe
File opened (read-only)	\??\N:	HelpMe.exe
File opened (read-only)	\??\K:	HelpMe.exe
File opened (read-only)	\??\M:	HelpMe.exe
File opened (read-only)	\??\T:	HelpMe.exe
File opened (read-only)	\??\V:	HelpMe.exe
File opened (read-only)	\??\Z:	HelpMe.exe
File opened (read-only)	\??\G:	HelpMe.exe
File opened (read-only)	\??\J:	HelpMe.exe
File opened (read-only)	\??\E:	HelpMe.exe
File opened (read-only)	\??\H:	HelpMe.exe
File opened (read-only)	\??\O:	HelpMe.exe
File opened (read-only)	\??\U:	HelpMe.exe
File opened (read-only)	\??\X:	HelpMe.exe
File opened (read-only)	\??\A:	HelpMe.exe
File opened (read-only)	\??\B:	HelpMe.exe

Drops autorun.inf file 1 TTPs 2 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

description	ioc	Process
File opened for modification	F:\AUTORUN.INF	HelpMe.exe
File opened for modification	C:\AUTORUN.INF	HelpMe.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\HelpMe.exe	HelpMe.exe
File created	C:\Windows\SysWOW64\notepad.exe.exe	HelpMe.exe
File opened for modification	C:\Windows\SysWOW64\HelpMe.exe	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe
File opened for modification	C:\Windows\SysWOW64\notepad.exe.exe	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe
File created	C:\Windows\SysWOW64\HelpMe.exe	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe
File created	C:\Windows\SysWOW64\HelpMe.exe	HelpMe.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Internet Explorer\iexplore.exe.exe	HelpMe.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\iexplore.exe.exe	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2176	HelpMe.exe
2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 2176	2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe	28
PID 2184 wrote to memory of 2176	2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe	28
PID 2184 wrote to memory of 2176	2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe	28
PID 2184 wrote to memory of 2176	2184	2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe	28

C:\Users\Admin\AppData\Local\Temp\2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe
"C:\Users\Admin\AppData\Local\Temp\2023-08-25_ffd6f7ea3d2f4b6fc78c583456dc0427_ryuk_JC.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2184
- C:\Windows\SysWOW64\HelpMe.exe
  C:\Windows\system32\HelpMe.exe
  2⤵
  - Modifies WinLogon for persistence
  - Drops startup file
  - Executes dropped EXE
  - Enumerates connected drives
  - Drops autorun.inf file
  - Drops file in System32 directory
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  PID:2176

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Replication Through Removable Media

T1091

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Replication Through Removable Media

T1091

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\$Recycle.Bin\S-1-5-21-607259312-1573743425-2763420908-1000\desktop.ini.exe

Filesize
11.3MB

MD5
8f7e8b6759296c24a300d8c68fd02ccf

SHA1
26985339434e387099276d5eef763471ec6107e2

SHA256
c421212543cd7ed897cf56054a1eb9e14997d97dba954ad9af9d2d600a9fdbe1

SHA512
4a4455545ab25c32309813d2e3838d82eeb887d779208ea8f8f575606bcb72c46283c5b8df5478285d6e23d777748530879ed8306f2618d7e57eeb8b2886e518

Download Submit
C:\Program Files (x86)\Internet Explorer\iexplore.exe.exe

Filesize
12.9MB

MD5
026fb2e80f0b4573efba1856ceba2c5c

SHA1
70c2ec191a50e309cc425682ac4c354e4a6bb7a4

SHA256
a20c9b21efef00338abad95f096d90778ee9d95f97e47a8038554ab39602e602

SHA512
39d320e17d2445901216766deabfa5e91353fd3d0d121a65d8fe9e586487330fcacb1d80a9be11d0ad470c4ba090c9ba79beeee6e5bc95130623f5bef23f9384

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk

Filesize
950B

MD5
58032f9e371b6df567845d9877a60946

SHA1
e468dc907e125beac94a6ebe26ee3d054cae7966

SHA256
e2500e934d59106b3b336287dce216aa4194b31b4680ad4fc0a9e100d7ffe7d0

SHA512
dd5107e2b0fc53dae999ae4f417f1be55e0153fb0c6338078021ccc27fcc836977fd02db266e72df926967fb9b7e43ab5437905560a505a5fac9e36c72d842c9

Download Submit
C:\Windows\SysWOW64\HelpMe.exe

Filesize
11.3MB

MD5
e737f029297781d9d0bb70fd32cd53a1

SHA1
442b2ff3401e9aaf32d05ad6314b3442389c01c8

SHA256
4df06fc64f3354ecbd6a9cfd5978f70fbefad5aed5ea9c391ef2ce7cf1227cbf

SHA512
4a9105970eb1afba9c28b3f98a8a9e7c2ee9eb5592c1d3bc66a93673a3a22e086825fa6a0f1792d2dd33af6b9a3597949d52730121219c8353c23aac053ff664

Download Submit
C:\Windows\SysWOW64\HelpMe.exe

Filesize
11.3MB

MD5
e737f029297781d9d0bb70fd32cd53a1

SHA1
442b2ff3401e9aaf32d05ad6314b3442389c01c8

SHA256
4df06fc64f3354ecbd6a9cfd5978f70fbefad5aed5ea9c391ef2ce7cf1227cbf

SHA512
4a9105970eb1afba9c28b3f98a8a9e7c2ee9eb5592c1d3bc66a93673a3a22e086825fa6a0f1792d2dd33af6b9a3597949d52730121219c8353c23aac053ff664

Download Submit
C:\Windows\SysWOW64\HelpMe.exe

Filesize
11.3MB

MD5
e737f029297781d9d0bb70fd32cd53a1

SHA1
442b2ff3401e9aaf32d05ad6314b3442389c01c8

SHA256
4df06fc64f3354ecbd6a9cfd5978f70fbefad5aed5ea9c391ef2ce7cf1227cbf

SHA512
4a9105970eb1afba9c28b3f98a8a9e7c2ee9eb5592c1d3bc66a93673a3a22e086825fa6a0f1792d2dd33af6b9a3597949d52730121219c8353c23aac053ff664

Download Submit
C:\Windows\SysWOW64\notepad.exe.exe

Filesize
12.3MB

MD5
edbfb12b0bd07712b262e3b11d7d57aa

SHA1
db9b8d1bd2d9478d81fb6a4bf3d3c3d6ab4c43d2

SHA256
177fef65cd4b125e20f85aa77df73cc90bedea655e95ec26adf8ae216a98638b

SHA512
cd3c7cb524579893883be1d4c6d7d553b40f8511bacbb8061dd53bac6ad87205a41d25dd852f5f6f9aa206b9c7155d4fe481d649ee0456bb25417e8de95dda14

Download Submit
F:\AUTORUN.INF

Filesize
145B

MD5
ca13857b2fd3895a39f09d9dde3cca97

SHA1
8b78c5b2ec97c372ebdcef92d14b0998f8dd6dd0

SHA256
cfe448b4506a95b33b529efa88f1ac704d8bdf98a941c065650ead27609318ae

SHA512
55e5b5325968d1e5314527fb2d26012f5aae4a1c38e305417be273400cb1c6d0c22b85bddb501d7a5720a3f53bb5caf6ada8a7894232344c4f6c6ef85d226b47

Download Submit
\Windows\SysWOW64\HelpMe.exe

Filesize
11.3MB

MD5
e737f029297781d9d0bb70fd32cd53a1

SHA1
442b2ff3401e9aaf32d05ad6314b3442389c01c8

SHA256
4df06fc64f3354ecbd6a9cfd5978f70fbefad5aed5ea9c391ef2ce7cf1227cbf

SHA512
4a9105970eb1afba9c28b3f98a8a9e7c2ee9eb5592c1d3bc66a93673a3a22e086825fa6a0f1792d2dd33af6b9a3597949d52730121219c8353c23aac053ff664

Download Submit
\Windows\SysWOW64\HelpMe.exe

Filesize
11.3MB

MD5
e737f029297781d9d0bb70fd32cd53a1

SHA1
442b2ff3401e9aaf32d05ad6314b3442389c01c8

SHA256
4df06fc64f3354ecbd6a9cfd5978f70fbefad5aed5ea9c391ef2ce7cf1227cbf

SHA512
4a9105970eb1afba9c28b3f98a8a9e7c2ee9eb5592c1d3bc66a93673a3a22e086825fa6a0f1792d2dd33af6b9a3597949d52730121219c8353c23aac053ff664

Download Submit
memory/2176-11-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2176-12-0x0000000000320000-0x0000000000321000-memory.dmp

Filesize
4KB

Download
memory/2176-89-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2184-9-0x0000000002A80000-0x0000000002AFB000-memory.dmp

Filesize
492KB

Download
memory/2184-0-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2184-26-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2184-1-0x00000000001B0000-0x00000000001B1000-memory.dmp

Filesize
4KB

Download