oski | a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88

Analysis

max time kernel
49s
max time network
121s
platform
windows7_x64
resource
win7v20210408
submitted
05-05-2021 11:01

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General

Target

proforma invoice No. 42037,pdf.exe
Size

31KB
MD5

1fc85b87347785b556af1d0f47a1f928
SHA1

c39c80b549f7dc46bfe18d5b956a4a17b28bac78
SHA256

a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88
SHA512

2c13b8f8e8845ed9ad2c5718a1fdbe16da06106b54cca04d8f978c0d15c1af8e90b900900e4b1c325e995ef5799101eee9edc182fc17c92dc33ecab478ac490c

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/1388-79-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger
behavioral1/memory/1388-80-0x000000000046446E-mapping.dmp	family_snakekeylogger
behavioral1/memory/1388-82-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger

Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

477036257571.exe477036257571.exe

pid process

1960 477036257571.exe
1388 477036257571.exe

pid	process
1960	477036257571.exe
1388	477036257571.exe

Loads dropped DLL 6 IoCs

Processes:

proforma invoice No. 42037,pdf.exe

pid	process
1284	proforma invoice No. 42037,pdf.exe
1284	proforma invoice No. 42037,pdf.exe
1284	proforma invoice No. 42037,pdf.exe
1284	proforma invoice No. 42037,pdf.exe
1284	proforma invoice No. 42037,pdf.exe
1284	proforma invoice No. 42037,pdf.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:

proforma invoice No. 42037,pdf.exe477036257571.exe

description	pid	process	target process
PID 1776 set thread context of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1960 set thread context of 1388	1960	477036257571.exe	477036257571.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:

proforma invoice No. 42037,pdf.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	proforma invoice No. 42037,pdf.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1164 taskkill.exe
NTFS ADS 1 IoCs

Processes:

proforma invoice No. 42037,pdf.exe

description ioc process

File created C:\ProgramData\477036257571.exe:Zone.Identifier proforma invoice No. 42037,pdf.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

477036257571.exe

pid process

1388 477036257571.exe

pid	process
1164	taskkill.exe

description	ioc	process
File created	C:\ProgramData\477036257571.exe:Zone.Identifier	proforma invoice No. 42037,pdf.exe

pid	process
1388	477036257571.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

proforma invoice No. 42037,pdf.exe477036257571.exe477036257571.exetaskkill.exe

description	pid	process
Token: SeDebugPrivilege	1776	proforma invoice No. 42037,pdf.exe
Token: SeDebugPrivilege	1960	477036257571.exe
Token: SeDebugPrivilege	1388	477036257571.exe
Token: SeDebugPrivilege	1164	taskkill.exe

Suspicious use of WriteProcessMemory 31 IoCs

Processes:

proforma invoice No. 42037,pdf.exeproforma invoice No. 42037,pdf.exe477036257571.execmd.exe

description	pid	process	target process
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1776 wrote to memory of 1284	1776	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 1284 wrote to memory of 1960	1284	proforma invoice No. 42037,pdf.exe	477036257571.exe
PID 1284 wrote to memory of 1960	1284	proforma invoice No. 42037,pdf.exe	477036257571.exe
PID 1284 wrote to memory of 1960	1284	proforma invoice No. 42037,pdf.exe	477036257571.exe
PID 1284 wrote to memory of 1960	1284	proforma invoice No. 42037,pdf.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1960 wrote to memory of 1388	1960	477036257571.exe	477036257571.exe
PID 1284 wrote to memory of 1688	1284	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 1284 wrote to memory of 1688	1284	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 1284 wrote to memory of 1688	1284	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 1284 wrote to memory of 1688	1284	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 1688 wrote to memory of 1164	1688	cmd.exe	taskkill.exe
PID 1688 wrote to memory of 1164	1688	cmd.exe	taskkill.exe
PID 1688 wrote to memory of 1164	1688	cmd.exe	taskkill.exe
PID 1688 wrote to memory of 1164	1688	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1776

C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:1284

C:\ProgramData\477036257571.exe
"C:\ProgramData\477036257571.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1960

C:\ProgramData\477036257571.exe
"C:\ProgramData\477036257571.exe"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1388

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1284 & erase C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe & RD /S /Q C:\\ProgramData\\542319025949268\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1688

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1284
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1164

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\477036257571.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

Download Submit
C:\ProgramData\477036257571.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

Download Submit
C:\ProgramData\477036257571.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Cookies\R76Z8LOJ.txt
MD5
cad25a07277effbcb41497f10bd102c7

SHA1
9694716226ea03cae91db1f5eb9a3cc4793bef8d

SHA256
5cf6e22b065dfcbc233468e95e876507bc384500d5ee456db74534aa11a0eedf

SHA512
352b6e2ed4e5f88602cfe073dae058c8cf730e2a85bcfdd8a97e197e6804797921b920e43b4a31747f036b008eccd058398cfbf3424ad5347727d18420d6a564

Download Submit
\ProgramData\477036257571.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

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/1164-86-0x0000000000000000-mapping.dmp

Download
memory/1284-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1284-64-0x000000000040717B-mapping.dmp

Download
memory/1284-65-0x0000000075C31000-0x0000000075C33000-memory.dmp

Filesize
8KB

Download
memory/1284-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1388-80-0x000000000046446E-mapping.dmp

Download
memory/1388-79-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/1388-82-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/1388-87-0x0000000004C10000-0x0000000004C11000-memory.dmp

Filesize
4KB

Download
memory/1688-85-0x0000000000000000-mapping.dmp

Download
memory/1776-59-0x0000000000C20000-0x0000000000C21000-memory.dmp

Filesize
4KB

Download
memory/1776-62-0x0000000000A40000-0x0000000000A61000-memory.dmp

Filesize
132KB

Download
memory/1776-61-0x0000000004E00000-0x0000000004E01000-memory.dmp

Filesize
4KB

Download
memory/1960-76-0x00000000012B0000-0x00000000012B1000-memory.dmp

Filesize
4KB

Download
memory/1960-73-0x0000000000000000-mapping.dmp

Download
memory/1960-83-0x0000000004BD0000-0x0000000004BD1000-memory.dmp

Filesize
4KB

Download