Analysis
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max time kernel
66s -
max time network
112s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
13-04-2021 09:11
Static task
static1
Behavioral task
behavioral1
Sample
IMG_578_60_28_61XLS.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
IMG_578_60_28_61XLS.exe
Resource
win10v20210408
General
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Target
IMG_578_60_28_61XLS.exe
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Size
560KB
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MD5
5ea03c09bf25d3d79ca5a936a18c0ae9
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SHA1
13806150e3063f266b2fa752a517a4dff3bea533
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SHA256
18cfa8c68fe25199694faf0d2e9fe0fe86e872b1c20620098a68309ade161000
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SHA512
2c15022a942ba5dc97425c614972fda775645bf01c9b9a063b0aae5f3dda5da16304016c9e4598aff70af887ecadd1946f34b18d43d82fa08ab31c8ab9ae2ab3
Malware Config
Extracted
oski
novget.com
Signatures
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Modifies WinLogon for persistence 2 TTPs 1 IoCs
Processes:
IMG_578_60_28_61XLS.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\chrom.exe\"," IMG_578_60_28_61XLS.exe -
Oski
Oski is an infostealer targeting browser data, crypto wallets.
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Downloads MZ/PE file
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Loads dropped DLL 3 IoCs
Processes:
IMG_578_60_28_61XLS.exepid process 496 IMG_578_60_28_61XLS.exe 496 IMG_578_60_28_61XLS.exe 496 IMG_578_60_28_61XLS.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Suspicious use of SetThreadContext 1 IoCs
Processes:
IMG_578_60_28_61XLS.exedescription pid process target process PID 852 set thread context of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
IMG_578_60_28_61XLS.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString IMG_578_60_28_61XLS.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 2644 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 5 IoCs
Processes:
IMG_578_60_28_61XLS.exepowershell.exepid process 852 IMG_578_60_28_61XLS.exe 852 IMG_578_60_28_61XLS.exe 972 powershell.exe 972 powershell.exe 972 powershell.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
Processes:
IMG_578_60_28_61XLS.exepowershell.exetaskkill.exedescription pid process Token: SeDebugPrivilege 852 IMG_578_60_28_61XLS.exe Token: SeDebugPrivilege 972 powershell.exe Token: SeDebugPrivilege 2644 taskkill.exe -
Suspicious use of WriteProcessMemory 18 IoCs
Processes:
IMG_578_60_28_61XLS.exeIMG_578_60_28_61XLS.execmd.exedescription pid process target process PID 852 wrote to memory of 972 852 IMG_578_60_28_61XLS.exe powershell.exe PID 852 wrote to memory of 972 852 IMG_578_60_28_61XLS.exe powershell.exe PID 852 wrote to memory of 972 852 IMG_578_60_28_61XLS.exe powershell.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 852 wrote to memory of 496 852 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.exe PID 496 wrote to memory of 396 496 IMG_578_60_28_61XLS.exe cmd.exe PID 496 wrote to memory of 396 496 IMG_578_60_28_61XLS.exe cmd.exe PID 496 wrote to memory of 396 496 IMG_578_60_28_61XLS.exe cmd.exe PID 396 wrote to memory of 2644 396 cmd.exe taskkill.exe PID 396 wrote to memory of 2644 396 cmd.exe taskkill.exe PID 396 wrote to memory of 2644 396 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe"C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe"1⤵
- Modifies WinLogon for persistence
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"powershell" Add-MpPreference -ExclusionPath C:\2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exeC:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 496 & erase C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe & RD /S /Q C:\\ProgramData\\432515406469135\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 4964⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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\ProgramData\mozglue.dllMD5
8f73c08a9660691143661bf7332c3c27
SHA137fa65dd737c50fda710fdbde89e51374d0c204a
SHA2563fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA5120042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89
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\ProgramData\nss3.dllMD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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\ProgramData\sqlite3.dllMD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c
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memory/396-190-0x0000000000000000-mapping.dmp
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memory/496-128-0x000000000040717B-mapping.dmp
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memory/496-132-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/496-127-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/852-118-0x0000000004DF0000-0x0000000004DF1000-memory.dmpFilesize
4KB
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memory/852-122-0x0000000004DF3000-0x0000000004DF5000-memory.dmpFilesize
8KB
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memory/852-121-0x0000000005390000-0x00000000053D1000-memory.dmpFilesize
260KB
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memory/852-120-0x00000000083A0000-0x000000000842A000-memory.dmpFilesize
552KB
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memory/852-119-0x0000000004EC0000-0x0000000004EC1000-memory.dmpFilesize
4KB
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memory/852-117-0x0000000004EE0000-0x0000000004EE1000-memory.dmpFilesize
4KB
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memory/852-116-0x00000000053E0000-0x00000000053E1000-memory.dmpFilesize
4KB
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memory/852-114-0x0000000000540000-0x0000000000541000-memory.dmpFilesize
4KB
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memory/972-133-0x0000000007850000-0x0000000007851000-memory.dmpFilesize
4KB
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memory/972-154-0x00000000094A0000-0x00000000094A1000-memory.dmpFilesize
4KB
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memory/972-134-0x0000000007FF0000-0x0000000007FF1000-memory.dmpFilesize
4KB
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memory/972-135-0x0000000007880000-0x0000000007881000-memory.dmpFilesize
4KB
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memory/972-136-0x0000000008060000-0x0000000008061000-memory.dmpFilesize
4KB
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memory/972-137-0x0000000007F40000-0x0000000007F41000-memory.dmpFilesize
4KB
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memory/972-138-0x0000000008960000-0x0000000008961000-memory.dmpFilesize
4KB
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memory/972-139-0x0000000008700000-0x0000000008701000-memory.dmpFilesize
4KB
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memory/972-147-0x00000000094C0000-0x00000000094F3000-memory.dmpFilesize
204KB
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memory/972-131-0x00000000072B2000-0x00000000072B3000-memory.dmpFilesize
4KB
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memory/972-159-0x0000000009600000-0x0000000009601000-memory.dmpFilesize
4KB
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memory/972-160-0x00000000099C0000-0x00000000099C1000-memory.dmpFilesize
4KB
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memory/972-163-0x000000007EE10000-0x000000007EE11000-memory.dmpFilesize
4KB
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memory/972-164-0x00000000072B3000-0x00000000072B4000-memory.dmpFilesize
4KB
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memory/972-130-0x00000000072B0000-0x00000000072B1000-memory.dmpFilesize
4KB
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memory/972-129-0x00000000078F0000-0x00000000078F1000-memory.dmpFilesize
4KB
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memory/972-126-0x0000000004C20000-0x0000000004C21000-memory.dmpFilesize
4KB
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memory/972-123-0x0000000000000000-mapping.dmp
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memory/2644-191-0x0000000000000000-mapping.dmp