oski | 79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0

General

Target

83437762e281a39dd2e3d24a77bed412.exe
Size

1.3MB
MD5

83437762e281a39dd2e3d24a77bed412
SHA1

c818383759ac632ba7b418e3a830d0a9e90b7cbb
SHA256

79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0
SHA512

e0edffaa9b1d221e8210c9078ce8e3fa72ece476d87d01bb9d998924e718be65546717f3cf08e65d514b3069b2bbb2e6854469ac837df31866a92e9919643d77

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

swsaseguranca.com.br

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1600 cmd.exe

pid	process
1600	cmd.exe

Loads dropped DLL 5 IoCs

Processes:

83437762e281a39dd2e3d24a77bed412.exe

pid	process
1384	83437762e281a39dd2e3d24a77bed412.exe
1384	83437762e281a39dd2e3d24a77bed412.exe
1384	83437762e281a39dd2e3d24a77bed412.exe
1384	83437762e281a39dd2e3d24a77bed412.exe
1384	83437762e281a39dd2e3d24a77bed412.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 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
Suspicious use of SetThreadContext 1 IoCs

Processes:

83437762e281a39dd2e3d24a77bed412.exe

description pid process target process

PID 1520 set thread context of 1384 1520 83437762e281a39dd2e3d24a77bed412.exe 83437762e281a39dd2e3d24a77bed412.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 1520 set thread context of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe

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:

83437762e281a39dd2e3d24a77bed412.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	83437762e281a39dd2e3d24a77bed412.exe

Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

432 schtasks.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1484 taskkill.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

83437762e281a39dd2e3d24a77bed412.exepowershell.exepowershell.exe

pid process

1520 83437762e281a39dd2e3d24a77bed412.exe
1520 83437762e281a39dd2e3d24a77bed412.exe
1536 powershell.exe
1892 powershell.exe

pid	process
432	schtasks.exe

pid	process
1484	taskkill.exe

pid	process
1520	83437762e281a39dd2e3d24a77bed412.exe
1520	83437762e281a39dd2e3d24a77bed412.exe
1536	powershell.exe
1892	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

83437762e281a39dd2e3d24a77bed412.exepowershell.exepowershell.exetaskkill.exe

description	pid	process
Token: SeDebugPrivilege	1520	83437762e281a39dd2e3d24a77bed412.exe
Token: SeDebugPrivilege	1536	powershell.exe
Token: SeDebugPrivilege	1892	powershell.exe
Token: SeDebugPrivilege	1484	taskkill.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

83437762e281a39dd2e3d24a77bed412.exe83437762e281a39dd2e3d24a77bed412.execmd.exe

description	pid	process	target process
PID 1520 wrote to memory of 1892	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1892	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1892	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1892	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1536	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1536	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1536	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 1536	1520	83437762e281a39dd2e3d24a77bed412.exe	powershell.exe
PID 1520 wrote to memory of 432	1520	83437762e281a39dd2e3d24a77bed412.exe	schtasks.exe
PID 1520 wrote to memory of 432	1520	83437762e281a39dd2e3d24a77bed412.exe	schtasks.exe
PID 1520 wrote to memory of 432	1520	83437762e281a39dd2e3d24a77bed412.exe	schtasks.exe
PID 1520 wrote to memory of 432	1520	83437762e281a39dd2e3d24a77bed412.exe	schtasks.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1520 wrote to memory of 1384	1520	83437762e281a39dd2e3d24a77bed412.exe	83437762e281a39dd2e3d24a77bed412.exe
PID 1384 wrote to memory of 1600	1384	83437762e281a39dd2e3d24a77bed412.exe	cmd.exe
PID 1384 wrote to memory of 1600	1384	83437762e281a39dd2e3d24a77bed412.exe	cmd.exe
PID 1384 wrote to memory of 1600	1384	83437762e281a39dd2e3d24a77bed412.exe	cmd.exe
PID 1384 wrote to memory of 1600	1384	83437762e281a39dd2e3d24a77bed412.exe	cmd.exe
PID 1600 wrote to memory of 1484	1600	cmd.exe	taskkill.exe
PID 1600 wrote to memory of 1484	1600	cmd.exe	taskkill.exe
PID 1600 wrote to memory of 1484	1600	cmd.exe	taskkill.exe
PID 1600 wrote to memory of 1484	1600	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\83437762e281a39dd2e3d24a77bed412.exe
"C:\Users\Admin\AppData\Local\Temp\83437762e281a39dd2e3d24a77bed412.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1520

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\83437762e281a39dd2e3d24a77bed412.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1892

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\fOQvCYq.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1536

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\fOQvCYq" /XML "C:\Users\Admin\AppData\Local\Temp\tmp47AA.tmp"
2⤵
- Creates scheduled task(s)
PID:432

C:\Users\Admin\AppData\Local\Temp\83437762e281a39dd2e3d24a77bed412.exe
"C:\Users\Admin\AppData\Local\Temp\83437762e281a39dd2e3d24a77bed412.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1384

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1384 & erase C:\Users\Admin\AppData\Local\Temp\83437762e281a39dd2e3d24a77bed412.exe & RD /S /Q C:\\ProgramData\\402598114233736\\* & exit
3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:1600

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1384
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1484

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp47AA.tmp
MD5
eef87cf531ea04c7fb59f2b59fa8fe17

SHA1
367e6393370f49bc9789e49a2eca4d17329884c8

SHA256
db710e6dd4af7e526a91cada1469534bfbd390c7254605db3d81cffd51f13231

SHA512
e0ff8bac83fc258156955814df4be0915046717f4d5f5e5280d29194f4adebee3677431797c8b43dda56fa9d11e062a621571a0b88cdab682a444da7052d4a40

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
MD5
78ed66d217cf99d6bf4e9e5cc4bcf072

SHA1
e3fe581749ee174985280acb7102f17940d78587

SHA256
a134448b4c3057a7922d40ad324582b4636eb717e10d339e2f1d844fe9fe99a5

SHA512
4db3b7b1714d229bd3ee39c98c10a45f91e8edd3c12d2d9b584b1b6d218ffdb354fbcbdd1cc1ebd5541188fa00890ac789fda10ccecbfc06f31bf2aba69838c8

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/432-64-0x0000000000000000-mapping.dmp

Download
memory/1384-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1384-73-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1384-68-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1384-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1384-70-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1384-71-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1384-74-0x000000000040717B-mapping.dmp

Download
memory/1384-80-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1484-89-0x0000000000000000-mapping.dmp

Download
memory/1520-55-0x0000000000FA0000-0x0000000000FA1000-memory.dmp

Filesize
4KB

Download
memory/1520-58-0x00000000003D0000-0x00000000003D8000-memory.dmp

Filesize
32KB

Download
memory/1520-59-0x0000000000770000-0x0000000000771000-memory.dmp

Filesize
4KB

Download
memory/1520-60-0x0000000005130000-0x0000000005252000-memory.dmp

Filesize
1.1MB

Download
memory/1520-57-0x0000000076A21000-0x0000000076A23000-memory.dmp

Filesize
8KB

Download
memory/1536-75-0x00000000022D0000-0x00000000022D1000-memory.dmp

Filesize
4KB

Download
memory/1536-81-0x00000000022D2000-0x00000000022D4000-memory.dmp

Filesize
8KB

Download
memory/1536-78-0x00000000022D1000-0x00000000022D2000-memory.dmp

Filesize
4KB

Download
memory/1536-63-0x0000000000000000-mapping.dmp

Download
memory/1600-88-0x0000000000000000-mapping.dmp

Download
memory/1892-77-0x0000000002311000-0x0000000002312000-memory.dmp

Filesize
4KB

Download
memory/1892-61-0x0000000000000000-mapping.dmp

Download
memory/1892-82-0x0000000002312000-0x0000000002314000-memory.dmp

Filesize
8KB

Download
memory/1892-76-0x0000000002310000-0x0000000002311000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads