d1623332c586135747a2575bec4ee783f299c5fca0f527f0328ea47691e9506d

Analysis

max time kernel
131s
max time network
132s
platform
windows10_x64
resource
win10v20210410
submitted
27-05-2021 15:34

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General

Target

ExcelViewerss.exe
Size

571KB
MD5

40d56ef0857cd5fe0ba21d20c73686e2
SHA1

90a8bdadbdebfcaf3a1e146472d56db7d531f921
SHA256

d1623332c586135747a2575bec4ee783f299c5fca0f527f0328ea47691e9506d
SHA512

74953fa8056f17e96831cf932a482907af00ef22008a4c829da339d3c55fb9696ba812c605155486971cdc4427cb85bf4d63f0e29ffdb46c602be083bdcdc038

Score

8^/10

upx

Malware Config

Signatures

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/932-119-0x0000000000400000-0x00000000004F6000-memory.dmp	upx

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3016 set thread context of 932	3016	ExcelViewerss.exe	79

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3016	ExcelViewerss.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
932	ExcelViewerss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeShutdownPrivilege	932	ExcelViewerss.exe
Token: SeCreatePagefilePrivilege	932	ExcelViewerss.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3016	ExcelViewerss.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3016 wrote to memory of 932	3016	ExcelViewerss.exe	79
PID 3016 wrote to memory of 932	3016	ExcelViewerss.exe	79
PID 3016 wrote to memory of 932	3016	ExcelViewerss.exe	79
PID 3016 wrote to memory of 932	3016	ExcelViewerss.exe	79
PID 932 wrote to memory of 1164	932	ExcelViewerss.exe	80
PID 932 wrote to memory of 1164	932	ExcelViewerss.exe	80
PID 932 wrote to memory of 1164	932	ExcelViewerss.exe	80

C:\Users\Admin\AppData\Local\Temp\ExcelViewerss.exe
"C:\Users\Admin\AppData\Local\Temp\ExcelViewerss.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3016
- C:\Users\Admin\AppData\Local\Temp\ExcelViewerss.exe
  "C:\Users\Admin\AppData\Local\Temp\ExcelViewerss.exe"
  2⤵
  - Suspicious behavior: RenamesItself
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:932
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\nJ3x4QfDj5RhAt3p.bat" "
    3⤵
    PID:1164

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/932-119-0x0000000000400000-0x00000000004F6000-memory.dmp

Filesize
984KB

Download
memory/932-120-0x0000000000500000-0x000000000064A000-memory.dmp

Filesize
1.3MB

Download
memory/3016-116-0x00000000021E0000-0x00000000021E1000-memory.dmp

Filesize
4KB

Download
memory/3016-118-0x00000000021F0000-0x00000000021F8000-memory.dmp

Filesize
32KB

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