oski | 640b55a360b6487d2082c5368a09a99530ed3c8eca2f9cdbe1aacac2c479b174

General

Target

9f20b06fd3a6a4eebd08cb94287d3130N.exe
Size

200KB
MD5

9f20b06fd3a6a4eebd08cb94287d3130
SHA1

10646ce92dd83d27e161500bd2a2a404c2c010a2
SHA256

640b55a360b6487d2082c5368a09a99530ed3c8eca2f9cdbe1aacac2c479b174
SHA512

b8465695f16f9801e19e1e60435f7301879bc91b0de4a90119340ed7e82fa4f26db063ef8597cdca22c1e58874d5c685657c2c50a92eb833365765943c51a71e
SSDEEP

3072:WfUomEuYm98dlSq7gt5q7Dx+XgS6aCEwhOfUbCalNT2pbB3fIB1Xi6FLPo3c:WfUauY68uSWCx+XA7mg2pNI1Ljo3c

Score

10^/10

oski credential_access discovery infostealer spyware stealer

Malware Config

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003
Downloads MZ/PE file

Deletes itself 1 IoCs

pid	Process
3044	cmd.exe

Loads dropped DLL 3 IoCs

pid	Process
2292	9f20b06fd3a6a4eebd08cb94287d3130N.exe
2292	9f20b06fd3a6a4eebd08cb94287d3130N.exe
2292	9f20b06fd3a6a4eebd08cb94287d3130N.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
T1552.001
Unsecured Credentials: Credentials In Files 1 TTPs
Steal credentials from unsecured files.
credential_access stealer

Credentials In Files
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9f20b06fd3a6a4eebd08cb94287d3130N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.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

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	9f20b06fd3a6a4eebd08cb94287d3130N.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1756	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1756	taskkill.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2292 wrote to memory of 3044	2292	9f20b06fd3a6a4eebd08cb94287d3130N.exe	31
PID 2292 wrote to memory of 3044	2292	9f20b06fd3a6a4eebd08cb94287d3130N.exe	31
PID 2292 wrote to memory of 3044	2292	9f20b06fd3a6a4eebd08cb94287d3130N.exe	31
PID 2292 wrote to memory of 3044	2292	9f20b06fd3a6a4eebd08cb94287d3130N.exe	31
PID 3044 wrote to memory of 1756	3044	cmd.exe	33
PID 3044 wrote to memory of 1756	3044	cmd.exe	33
PID 3044 wrote to memory of 1756	3044	cmd.exe	33
PID 3044 wrote to memory of 1756	3044	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\9f20b06fd3a6a4eebd08cb94287d3130N.exe
"C:\Users\Admin\AppData\Local\Temp\9f20b06fd3a6a4eebd08cb94287d3130N.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:2292
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 2292 & erase C:\Users\Admin\AppData\Local\Temp\9f20b06fd3a6a4eebd08cb94287d3130N.exe & RD /S /Q C:\\ProgramData\\628876833549439\\* & exit
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3044
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 2292
    3⤵
    - System Location Discovery: System Language Discovery
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1756

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

3

T1552

Credentials In Files

3

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\mozglue.dll

Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

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\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

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\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

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Analysis

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