Analysis
-
max time kernel
115s -
max time network
113s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
20-04-2021 20:26
Static task
static1
Behavioral task
behavioral1
Sample
New#PO-910974.pdf.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
New#PO-910974.pdf.exe
Resource
win10v20210408
General
-
Target
New#PO-910974.pdf.exe
-
Size
136KB
-
MD5
a5927ee08778a03b9a85bdbe8614045c
-
SHA1
b11323997a972820db34d5353f89327de427c2a7
-
SHA256
5848b5efeea58c2c353b352f7f0d2043dc806cb9d387ca6206562773c95cb37e
-
SHA512
60150f9a1a23685ecfce5359076d815359b62800d99ac580ea6c4272e85b5065365ef582eccc67e01c7db1128b37c6b76d3cc429bd47edade7468fa78db690a0
Malware Config
Extracted
guloader
https://drive.google.com/uc?export=download&id=1Mt156cEQBM8iCmgCoxOvvzyFlkQ-bWCX
Extracted
oski
45.85.90.86
Signatures
-
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
-
Oski
Oski is an infostealer targeting browser data, crypto wallets.
-
Guloader Payload 3 IoCs
Processes:
resource yara_rule behavioral2/memory/632-116-0x00000000001C0000-0x00000000001CD000-memory.dmp family_guloader behavioral2/memory/2784-117-0x00000000004016C4-mapping.dmp family_guloader behavioral2/memory/2784-120-0x0000000000560000-0x0000000000660000-memory.dmp family_guloader -
Downloads MZ/PE file
-
Checks QEMU agent file 2 TTPs 2 IoCs
Checks presence of QEMU agent, possibly to detect virtualization.
Processes:
New#PO-910974.pdf.exeNew#PO-910974.pdf.exedescription ioc process File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe New#PO-910974.pdf.exe File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe New#PO-910974.pdf.exe -
Loads dropped DLL 3 IoCs
Processes:
New#PO-910974.pdf.exepid process 2784 New#PO-910974.pdf.exe 2784 New#PO-910974.pdf.exe 2784 New#PO-910974.pdf.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
-
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
-
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
-
Legitimate hosting services abused for malware hosting/C2 1 TTPs
-
Suspicious use of NtSetInformationThreadHideFromDebugger 3 IoCs
Processes:
New#PO-910974.pdf.exeNew#PO-910974.pdf.exepid process 632 New#PO-910974.pdf.exe 2784 New#PO-910974.pdf.exe 2784 New#PO-910974.pdf.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
New#PO-910974.pdf.exedescription pid process target process PID 632 set thread context of 2784 632 New#PO-910974.pdf.exe New#PO-910974.pdf.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
-
Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
New#PO-910974.pdf.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString New#PO-910974.pdf.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1720 taskkill.exe -
Suspicious behavior: MapViewOfSection 1 IoCs
Processes:
New#PO-910974.pdf.exepid process 632 New#PO-910974.pdf.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 1720 taskkill.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
New#PO-910974.pdf.exepid process 632 New#PO-910974.pdf.exe -
Suspicious use of WriteProcessMemory 10 IoCs
Processes:
New#PO-910974.pdf.exeNew#PO-910974.pdf.execmd.exedescription pid process target process PID 632 wrote to memory of 2784 632 New#PO-910974.pdf.exe New#PO-910974.pdf.exe PID 632 wrote to memory of 2784 632 New#PO-910974.pdf.exe New#PO-910974.pdf.exe PID 632 wrote to memory of 2784 632 New#PO-910974.pdf.exe New#PO-910974.pdf.exe PID 632 wrote to memory of 2784 632 New#PO-910974.pdf.exe New#PO-910974.pdf.exe PID 2784 wrote to memory of 3832 2784 New#PO-910974.pdf.exe cmd.exe PID 2784 wrote to memory of 3832 2784 New#PO-910974.pdf.exe cmd.exe PID 2784 wrote to memory of 3832 2784 New#PO-910974.pdf.exe cmd.exe PID 3832 wrote to memory of 1720 3832 cmd.exe taskkill.exe PID 3832 wrote to memory of 1720 3832 cmd.exe taskkill.exe PID 3832 wrote to memory of 1720 3832 cmd.exe taskkill.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\New#PO-910974.pdf.exe"C:\Users\Admin\AppData\Local\Temp\New#PO-910974.pdf.exe"1⤵
- Checks QEMU agent file
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\New#PO-910974.pdf.exe"C:\Users\Admin\AppData\Local\Temp\New#PO-910974.pdf.exe"2⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 2784 & erase C:\Users\Admin\AppData\Local\Temp\New#PO-910974.pdf.exe & RD /S /Q C:\\ProgramData\\310427282668737\\* & exit3⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 27844⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
\ProgramData\mozglue.dllMD5
8f73c08a9660691143661bf7332c3c27
SHA137fa65dd737c50fda710fdbde89e51374d0c204a
SHA2563fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA5120042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89
-
\ProgramData\nss3.dllMD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
-
\ProgramData\sqlite3.dllMD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c
-
memory/632-116-0x00000000001C0000-0x00000000001CD000-memory.dmpFilesize
52KB
-
memory/1720-127-0x0000000000000000-mapping.dmp
-
memory/2784-117-0x00000000004016C4-mapping.dmp
-
memory/2784-118-0x0000000000400000-0x0000000000553000-memory.dmpFilesize
1.3MB
-
memory/2784-119-0x0000000000401000-0x00000000004FD000-memory.dmpFilesize
1008KB
-
memory/2784-120-0x0000000000560000-0x0000000000660000-memory.dmpFilesize
1024KB
-
memory/2784-121-0x0000000000401000-0x0000000000541000-memory.dmpFilesize
1.2MB
-
memory/2784-122-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
-
memory/3832-126-0x0000000000000000-mapping.dmp