oski | edb5b2e40ba1596106785ac718cbb576310e3c05674a5db31189f4a1dc753677

Analysis

max time kernel
43s
max time network
113s
platform
windows7_x64
resource
win7v20210410
submitted
06-05-2021 13:08

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General

Target

15be16213deac30838b2850d866bdf5382402e2d.exe
Size

33KB
MD5

9a4b975c10dfc590337ee6d960aa4a02
SHA1

15be16213deac30838b2850d866bdf5382402e2d
SHA256

edb5b2e40ba1596106785ac718cbb576310e3c05674a5db31189f4a1dc753677
SHA512

d3bdfc2d3a9d06050ac1f6e38b7bb842033d6658e61be891ba6581d0d9a735bc9f72ac341a0531efa8e68dfa29f205dfd7785c9d330641cbc493f7c790f4bcfb

Score

10^/10

oski snakekeylogger discovery infostealer keylogger spyware stealer

Malware Config

Extracted

Family

oski

203.159.80.72

Extracted

Family

snakekeylogger

https://api.telegram.org/bot1761516426:AAE3Juu_v6fG9Gy1S33LdTvyz85ua-duZsk/sendMessage?chat_id=1727399585

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
stealer keylogger snakekeylogger

Snake Keylogger Payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1540-81-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger
behavioral1/memory/1540-83-0x000000000046446E-mapping.dmp	family_snakekeylogger
behavioral1/memory/1540-85-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger

Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

383956225170.exe383956225170.exe

pid process

1188 383956225170.exe
1540 383956225170.exe
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

888 cmd.exe

pid	process
1188	383956225170.exe
1540	383956225170.exe

pid	process
888	cmd.exe

Loads dropped DLL 6 IoCs

Processes:

15be16213deac30838b2850d866bdf5382402e2d.exe

pid	process
1536	15be16213deac30838b2850d866bdf5382402e2d.exe
1536	15be16213deac30838b2850d866bdf5382402e2d.exe
1536	15be16213deac30838b2850d866bdf5382402e2d.exe
1536	15be16213deac30838b2850d866bdf5382402e2d.exe
1536	15be16213deac30838b2850d866bdf5382402e2d.exe
1536	15be16213deac30838b2850d866bdf5382402e2d.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

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

Data from Local System
T1005

Credentials in Files
T1081
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.

Processes:

flow ioc

13 checkip.dyndns.org
16 freegeoip.app
17 freegeoip.app

flow	ioc
13	checkip.dyndns.org
16	freegeoip.app
17	freegeoip.app

Suspicious use of SetThreadContext 2 IoCs

Processes:

15be16213deac30838b2850d866bdf5382402e2d.exe383956225170.exe

description	pid	process	target process
PID 540 set thread context of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 1188 set thread context of 1540	1188	383956225170.exe	383956225170.exe

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 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

15be16213deac30838b2850d866bdf5382402e2d.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	15be16213deac30838b2850d866bdf5382402e2d.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1656 taskkill.exe
NTFS ADS 1 IoCs

Processes:

15be16213deac30838b2850d866bdf5382402e2d.exe

description ioc process

File created C:\ProgramData\383956225170.exe:Zone.Identifier 15be16213deac30838b2850d866bdf5382402e2d.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

383956225170.exe

pid process

1540 383956225170.exe

pid	process
1656	taskkill.exe

description	ioc	process
File created	C:\ProgramData\383956225170.exe:Zone.Identifier	15be16213deac30838b2850d866bdf5382402e2d.exe

pid	process
1540	383956225170.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

15be16213deac30838b2850d866bdf5382402e2d.exe383956225170.exe383956225170.exetaskkill.exe

description	pid	process
Token: SeDebugPrivilege	540	15be16213deac30838b2850d866bdf5382402e2d.exe
Token: SeDebugPrivilege	1188	383956225170.exe
Token: SeDebugPrivilege	1540	383956225170.exe
Token: SeDebugPrivilege	1656	taskkill.exe

Suspicious use of WriteProcessMemory 31 IoCs

Processes:

15be16213deac30838b2850d866bdf5382402e2d.exe15be16213deac30838b2850d866bdf5382402e2d.exe383956225170.execmd.exe

description	pid	process	target process
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 540 wrote to memory of 1536	540	15be16213deac30838b2850d866bdf5382402e2d.exe	15be16213deac30838b2850d866bdf5382402e2d.exe
PID 1536 wrote to memory of 1188	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	383956225170.exe
PID 1536 wrote to memory of 1188	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	383956225170.exe
PID 1536 wrote to memory of 1188	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	383956225170.exe
PID 1536 wrote to memory of 1188	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	383956225170.exe
PID 1536 wrote to memory of 888	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	cmd.exe
PID 1536 wrote to memory of 888	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	cmd.exe
PID 1536 wrote to memory of 888	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	cmd.exe
PID 1536 wrote to memory of 888	1536	15be16213deac30838b2850d866bdf5382402e2d.exe	cmd.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 1188 wrote to memory of 1540	1188	383956225170.exe	383956225170.exe
PID 888 wrote to memory of 1656	888	cmd.exe	taskkill.exe
PID 888 wrote to memory of 1656	888	cmd.exe	taskkill.exe
PID 888 wrote to memory of 1656	888	cmd.exe	taskkill.exe
PID 888 wrote to memory of 1656	888	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\15be16213deac30838b2850d866bdf5382402e2d.exe
"C:\Users\Admin\AppData\Local\Temp\15be16213deac30838b2850d866bdf5382402e2d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:540

C:\Users\Admin\AppData\Local\Temp\15be16213deac30838b2850d866bdf5382402e2d.exe
"C:\Users\Admin\AppData\Local\Temp\15be16213deac30838b2850d866bdf5382402e2d.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:1536

C:\ProgramData\383956225170.exe
"C:\ProgramData\383956225170.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1188

C:\ProgramData\383956225170.exe
"C:\ProgramData\383956225170.exe"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1540

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1536 & erase C:\Users\Admin\AppData\Local\Temp\15be16213deac30838b2850d866bdf5382402e2d.exe & RD /S /Q C:\\ProgramData\\482735132931061\\* & exit
3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:888

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1536
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1656

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\383956225170.exe
MD5
d7a28e461fc2dde6e3a65bf17231e897

SHA1
e7d84a5953d63ff63d9fd30c5225710e72de014c

SHA256
3c93f92ea751655e9f14691c73373699b57b33fe1d6c4e052a76bacd6b63b17c

SHA512
722cc5ce33bd832b05db885635a0fbf9714faf079672db633346882738203db332eccfae70bc3cb6b4799fd2d738a50c5891f5adeefc8c746b3033b842c01a40

Download Submit
C:\ProgramData\383956225170.exe
MD5
d7a28e461fc2dde6e3a65bf17231e897

SHA1
e7d84a5953d63ff63d9fd30c5225710e72de014c

SHA256
3c93f92ea751655e9f14691c73373699b57b33fe1d6c4e052a76bacd6b63b17c

SHA512
722cc5ce33bd832b05db885635a0fbf9714faf079672db633346882738203db332eccfae70bc3cb6b4799fd2d738a50c5891f5adeefc8c746b3033b842c01a40

Download Submit
C:\ProgramData\383956225170.exe
MD5
d7a28e461fc2dde6e3a65bf17231e897

SHA1
e7d84a5953d63ff63d9fd30c5225710e72de014c

SHA256
3c93f92ea751655e9f14691c73373699b57b33fe1d6c4e052a76bacd6b63b17c

SHA512
722cc5ce33bd832b05db885635a0fbf9714faf079672db633346882738203db332eccfae70bc3cb6b4799fd2d738a50c5891f5adeefc8c746b3033b842c01a40

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Cookies\NOIUL5AS.txt
MD5
2ab8ae772ec134f996faa9eb226e9b5a

SHA1
e2d17c910a3511a06b794bea14ff4f50d82d3884

SHA256
666afc771157eede0dc2277af9ca28d08a9dc9c53653fe37d19da845d0a06961

SHA512
1baa14e827454db66c00801506fda182d39979bab3321095dd65810d837959eae94c4e1d5422f2b5ce5fa3086c15980f72d527a0f03c91cb89bba0d37f340432

Download Submit
\ProgramData\383956225170.exe
MD5
d7a28e461fc2dde6e3a65bf17231e897

SHA1
e7d84a5953d63ff63d9fd30c5225710e72de014c

SHA256
3c93f92ea751655e9f14691c73373699b57b33fe1d6c4e052a76bacd6b63b17c

SHA512
722cc5ce33bd832b05db885635a0fbf9714faf079672db633346882738203db332eccfae70bc3cb6b4799fd2d738a50c5891f5adeefc8c746b3033b842c01a40

Download Submit
\ProgramData\mozglue.dll
MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\msvcp140.dll
MD5
109f0f02fd37c84bfc7508d4227d7ed5

SHA1
ef7420141bb15ac334d3964082361a460bfdb975

SHA256
334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

SHA512
46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

Download Submit
\ProgramData\nss3.dll
MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll
MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
\ProgramData\vcruntime140.dll
MD5
7587bf9cb4147022cd5681b015183046

SHA1
f2106306a8f6f0da5afb7fc765cfa0757ad5a628

SHA256
c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

SHA512
0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

Download Submit
memory/540-60-0x0000000001050000-0x0000000001051000-memory.dmp

Filesize
4KB

Download
memory/540-63-0x0000000000330000-0x0000000000351000-memory.dmp

Filesize
132KB

Download
memory/540-62-0x0000000004900000-0x0000000004901000-memory.dmp

Filesize
4KB

Download
memory/888-79-0x0000000000000000-mapping.dmp

Download
memory/1188-87-0x0000000004B30000-0x0000000004B31000-memory.dmp

Filesize
4KB

Download
memory/1188-74-0x0000000000000000-mapping.dmp

Download
memory/1188-77-0x0000000000DD0000-0x0000000000DD1000-memory.dmp

Filesize
4KB

Download
memory/1536-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1536-66-0x0000000075A71000-0x0000000075A73000-memory.dmp

Filesize
8KB

Download
memory/1536-65-0x000000000040717B-mapping.dmp

Download
memory/1536-64-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1540-81-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/1540-83-0x000000000046446E-mapping.dmp

Download
memory/1540-85-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/1540-88-0x00000000006B0000-0x00000000006B1000-memory.dmp

Filesize
4KB

Download
memory/1656-82-0x0000000000000000-mapping.dmp

Download