oski | 95bb38f864cb2a18cc598ce238ef85dc5eae8de91c0f2e58c175460fc8ebe94d

General

Target

Invoice.exe
Size

974KB
MD5

288e1e9a0d79b265aaf409a1c39b67dd
SHA1

daccc93545a168dcb69dd8b18ab01ca1f4a68cbc
SHA256

95bb38f864cb2a18cc598ce238ef85dc5eae8de91c0f2e58c175460fc8ebe94d
SHA512

1dedd914fdf8bb966525bb951a348a61ab91d1f1384fb035034eac07d331c09bc460f88cd9412c677998b9bf84a2b6e1d99f2c64e0b79a8a1976b11a9481641b
SSDEEP

24576:jZ5hSCAlqmCXyvuDdGBGwZcZoyMgvN6QAJXY+mzo3bv:d5hStqmSycYGayMgl6QUlmzM

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

v.m-fit.biz

Signatures

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

Deletes itself 1 IoCs

pid	Process
1160	cmd.exe

Loads dropped DLL 3 IoCs

pid	Process
1568	Invoice.exe
1568	Invoice.exe
1568	Invoice.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

description	pid	Process	procid_target
PID 2008 set thread context of 1568	2008	Invoice.exe	27

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

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

Kills process with taskkill 1 IoCs

evasion

pid	Process
1056	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1056	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 2008 wrote to memory of 1568	2008	Invoice.exe	27
PID 1568 wrote to memory of 1160	1568	Invoice.exe	30
PID 1568 wrote to memory of 1160	1568	Invoice.exe	30
PID 1568 wrote to memory of 1160	1568	Invoice.exe	30
PID 1568 wrote to memory of 1160	1568	Invoice.exe	30
PID 1160 wrote to memory of 1056	1160	cmd.exe	32
PID 1160 wrote to memory of 1056	1160	cmd.exe	32
PID 1160 wrote to memory of 1056	1160	cmd.exe	32
PID 1160 wrote to memory of 1056	1160	cmd.exe	32

C:\Users\Admin\AppData\Local\Temp\Invoice.exe
"C:\Users\Admin\AppData\Local\Temp\Invoice.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2008
- C:\Users\Admin\AppData\Local\Temp\Invoice.exe
  "C:\Users\Admin\AppData\Local\Temp\Invoice.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1568
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1568 & erase C:\Users\Admin\AppData\Local\Temp\Invoice.exe & RD /S /Q C:\\ProgramData\\127208953899843\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1160
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1568
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

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

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

Download Submit
\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

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memory/1568-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-61-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-65-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-79-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-60-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1568-74-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2008-59-0x00000000022B0000-0x00000000022E8000-memory.dmp

Filesize
224KB

Download
memory/2008-58-0x00000000052F0000-0x0000000005380000-memory.dmp

Filesize
576KB

Download
memory/2008-57-0x0000000000360000-0x000000000036C000-memory.dmp

Filesize
48KB

Download
memory/2008-56-0x0000000000330000-0x0000000000348000-memory.dmp

Filesize
96KB

Download
memory/2008-54-0x0000000000B80000-0x0000000000C7A000-memory.dmp

Filesize
1000KB

Download
memory/2008-55-0x00000000761F1000-0x00000000761F3000-memory.dmp

Filesize
8KB

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Analysis

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