oski | 2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687

Analysis

max time kernel
44s
max time network
119s
platform
windows7_x64
resource
win7v20210410
submitted
04-05-2021 15:36

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General

Target

Proforma adjunta Nº 42037,pdf.exe
Size

34KB
MD5

f7565a4825eb92f2859114bb5a08b60d
SHA1

83d47736d04939e1c01b3df7720109c6d5ca9f78
SHA256

2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687
SHA512

2ad41ac31f5349ca16bd6112663a7ca6dc4a9e77562ca12458a54337a779ffbb9b7b91a710cabd37944b001001fede4c803cd40e47e78393b13a162c9cf78ac4

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/292-82-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger
behavioral1/memory/292-83-0x000000000046446E-mapping.dmp	family_snakekeylogger
behavioral1/memory/292-85-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger

Downloads MZ/PE file
Executes dropped EXE 3 IoCs

Processes:

392929501900.exe392929501900.exe392929501900.exe

pid process

924 392929501900.exe
536 392929501900.exe
292 392929501900.exe

pid	process
924	392929501900.exe
536	392929501900.exe
292	392929501900.exe

Loads dropped DLL 6 IoCs

Processes:

Proforma adjunta Nº 42037,pdf.exe

pid	process
1768	Proforma adjunta Nº 42037,pdf.exe
1768	Proforma adjunta Nº 42037,pdf.exe
1768	Proforma adjunta Nº 42037,pdf.exe
1768	Proforma adjunta Nº 42037,pdf.exe
1768	Proforma adjunta Nº 42037,pdf.exe
1768	Proforma adjunta 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 adjunta Nº 42037,pdf.exe392929501900.exe

description	pid	process	target process
PID 1084 set thread context of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 924 set thread context of 292	924	392929501900.exe	392929501900.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 adjunta Nº 42037,pdf.exe

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

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1596 taskkill.exe
NTFS ADS 1 IoCs

Processes:

Proforma adjunta Nº 42037,pdf.exe

description ioc process

File created C:\ProgramData\392929501900.exe:Zone.Identifier Proforma adjunta Nº 42037,pdf.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

392929501900.exe392929501900.exe

pid process

924 392929501900.exe
924 392929501900.exe
292 392929501900.exe

pid	process
1596	taskkill.exe

description	ioc	process
File created	C:\ProgramData\392929501900.exe:Zone.Identifier	Proforma adjunta Nº 42037,pdf.exe

pid	process
924	392929501900.exe
924	392929501900.exe
292	392929501900.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

Proforma adjunta Nº 42037,pdf.exe392929501900.exetaskkill.exe392929501900.exe

description	pid	process
Token: SeDebugPrivilege	1084	Proforma adjunta Nº 42037,pdf.exe
Token: SeDebugPrivilege	924	392929501900.exe
Token: SeDebugPrivilege	1596	taskkill.exe
Token: SeDebugPrivilege	292	392929501900.exe

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

Proforma adjunta Nº 42037,pdf.exeProforma adjunta Nº 42037,pdf.execmd.exe392929501900.exe

description	pid	process	target process
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1084 wrote to memory of 1768	1084	Proforma adjunta Nº 42037,pdf.exe	Proforma adjunta Nº 42037,pdf.exe
PID 1768 wrote to memory of 924	1768	Proforma adjunta Nº 42037,pdf.exe	392929501900.exe
PID 1768 wrote to memory of 924	1768	Proforma adjunta Nº 42037,pdf.exe	392929501900.exe
PID 1768 wrote to memory of 924	1768	Proforma adjunta Nº 42037,pdf.exe	392929501900.exe
PID 1768 wrote to memory of 924	1768	Proforma adjunta Nº 42037,pdf.exe	392929501900.exe
PID 1768 wrote to memory of 1716	1768	Proforma adjunta Nº 42037,pdf.exe	cmd.exe
PID 1768 wrote to memory of 1716	1768	Proforma adjunta Nº 42037,pdf.exe	cmd.exe
PID 1768 wrote to memory of 1716	1768	Proforma adjunta Nº 42037,pdf.exe	cmd.exe
PID 1768 wrote to memory of 1716	1768	Proforma adjunta Nº 42037,pdf.exe	cmd.exe
PID 1716 wrote to memory of 1596	1716	cmd.exe	taskkill.exe
PID 1716 wrote to memory of 1596	1716	cmd.exe	taskkill.exe
PID 1716 wrote to memory of 1596	1716	cmd.exe	taskkill.exe
PID 1716 wrote to memory of 1596	1716	cmd.exe	taskkill.exe
PID 924 wrote to memory of 536	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 536	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 536	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 536	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe
PID 924 wrote to memory of 292	924	392929501900.exe	392929501900.exe

C:\Users\Admin\AppData\Local\Temp\Proforma adjunta Nº 42037,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Proforma adjunta Nº 42037,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1084

C:\Users\Admin\AppData\Local\Temp\Proforma adjunta Nº 42037,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Proforma adjunta Nº 42037,pdf.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:1768

C:\ProgramData\392929501900.exe
"C:\ProgramData\392929501900.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:924

C:\ProgramData\392929501900.exe
"C:\ProgramData\392929501900.exe"
4⤵
- Executes dropped EXE
PID:536

C:\ProgramData\392929501900.exe
"C:\ProgramData\392929501900.exe"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:292

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1768 & erase C:\Users\Admin\AppData\Local\Temp\Proforma adjunta Nº 42037,pdf.exe & RD /S /Q C:\\ProgramData\\000478446148089\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1716

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1768
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1596

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\392929501900.exe
MD5
4f32642f936b50ba29756943849e5933

SHA1
0e832a5216e56000ef6c3a72035b884a0787a8f6

SHA256
c9201fcb3e6cb7d75e3c09f2c6de4e42144bf8c43e11be23f9c004f9eb8b02eb

SHA512
28d93f7e3ba3b07323ef570901d6f768835fc20205f2918bc1d0072ebfa51040d2a3cad776a305040efbbedfcb893e394791b880a61e2a29c8366b2f618349e8

Download Submit
C:\ProgramData\392929501900.exe
MD5
4f32642f936b50ba29756943849e5933

SHA1
0e832a5216e56000ef6c3a72035b884a0787a8f6

SHA256
c9201fcb3e6cb7d75e3c09f2c6de4e42144bf8c43e11be23f9c004f9eb8b02eb

SHA512
28d93f7e3ba3b07323ef570901d6f768835fc20205f2918bc1d0072ebfa51040d2a3cad776a305040efbbedfcb893e394791b880a61e2a29c8366b2f618349e8

Download Submit
C:\ProgramData\392929501900.exe
MD5
4f32642f936b50ba29756943849e5933

SHA1
0e832a5216e56000ef6c3a72035b884a0787a8f6

SHA256
c9201fcb3e6cb7d75e3c09f2c6de4e42144bf8c43e11be23f9c004f9eb8b02eb

SHA512
28d93f7e3ba3b07323ef570901d6f768835fc20205f2918bc1d0072ebfa51040d2a3cad776a305040efbbedfcb893e394791b880a61e2a29c8366b2f618349e8

Download Submit
C:\ProgramData\392929501900.exe
MD5
4f32642f936b50ba29756943849e5933

SHA1
0e832a5216e56000ef6c3a72035b884a0787a8f6

SHA256
c9201fcb3e6cb7d75e3c09f2c6de4e42144bf8c43e11be23f9c004f9eb8b02eb

SHA512
28d93f7e3ba3b07323ef570901d6f768835fc20205f2918bc1d0072ebfa51040d2a3cad776a305040efbbedfcb893e394791b880a61e2a29c8366b2f618349e8

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Cookies\42GYAW0Y.txt
MD5
316b065c8fc1a35a81d0111c34d9da4c

SHA1
ecdc8f1c4978bb766d9e22c8fee246fbd6bf5a18

SHA256
74eb03d2e1a875479396fdff163359ce6aaf99b7a6aac680c3ddabc6c9e2772d

SHA512
5d9c4b4b22f1e19f45b2f919df30066c635e0b73d17250a577918a392a7a46efdc694df59176dfe2d65b33643a72cbac8cf7dbbe9299e4815b25db5c462fa219

Download Submit
\ProgramData\392929501900.exe
MD5
4f32642f936b50ba29756943849e5933

SHA1
0e832a5216e56000ef6c3a72035b884a0787a8f6

SHA256
c9201fcb3e6cb7d75e3c09f2c6de4e42144bf8c43e11be23f9c004f9eb8b02eb

SHA512
28d93f7e3ba3b07323ef570901d6f768835fc20205f2918bc1d0072ebfa51040d2a3cad776a305040efbbedfcb893e394791b880a61e2a29c8366b2f618349e8

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/292-89-0x00000000047E0000-0x00000000047E1000-memory.dmp

Filesize
4KB

Download
memory/292-83-0x000000000046446E-mapping.dmp

Download
memory/292-82-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/292-85-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/924-87-0x0000000004D20000-0x0000000004D21000-memory.dmp

Filesize
4KB

Download
memory/924-76-0x00000000001B0000-0x00000000001B1000-memory.dmp

Filesize
4KB

Download
memory/924-73-0x0000000000000000-mapping.dmp

Download
memory/1084-62-0x00000000009A0000-0x00000000009C1000-memory.dmp

Filesize
132KB

Download
memory/1084-59-0x0000000000F70000-0x0000000000F71000-memory.dmp

Filesize
4KB

Download
memory/1084-61-0x0000000004EF0000-0x0000000004EF1000-memory.dmp

Filesize
4KB

Download
memory/1596-79-0x0000000000000000-mapping.dmp

Download
memory/1716-78-0x0000000000000000-mapping.dmp

Download
memory/1768-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1768-65-0x00000000752F1000-0x00000000752F3000-memory.dmp

Filesize
8KB

Download
memory/1768-64-0x000000000040717B-mapping.dmp

Download
memory/1768-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download