ff03a31c53b6e540bb918372dbc2a0213e5020273c6c46fdb2ef5f86ec7a0397

Analysis

max time kernel
150s
max time network
174s
platform
windows7_x64
resource
win7v20210408
submitted
19-07-2021 13:06

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General

Target

a4bd709d2da4d231ecbeca29fa852bdd.exe
Size

5.9MB
MD5

a4bd709d2da4d231ecbeca29fa852bdd
SHA1

4cad398255d98302db4bff95ef837a8adef11472
SHA256

ff03a31c53b6e540bb918372dbc2a0213e5020273c6c46fdb2ef5f86ec7a0397
SHA512

7c44d71b6aa8e3939c191aed3da246e53b77c121ab6b605b7b1ab799ea49ac195050d3c7066a3e1214cd5899bc50bfc1e67063509d4eccf99481c54bf60ed8f1

Score

9^/10

evasion themida trojan

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 3 IoCs

pid	Process
1804	MicrosoftApi.exe
1096	MicrosoftApi.exe
1520	ScreanDriver.exe

Checks BIOS information in registry 2 TTPs 6 IoCs

BIOS 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\VideoBiosVersion	a4bd709d2da4d231ecbeca29fa852bdd.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	MicrosoftApi.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	MicrosoftApi.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	MicrosoftApi.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	MicrosoftApi.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	a4bd709d2da4d231ecbeca29fa852bdd.exe

Loads dropped DLL 2 IoCs

pid	Process
1724	a4bd709d2da4d231ecbeca29fa852bdd.exe
1096	MicrosoftApi.exe

Themida packer 6 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/1724-61-0x000000013F960000-0x000000013F961000-memory.dmp	themida
behavioral1/files/0x00040000000130b4-65.dat	themida
behavioral1/files/0x00040000000130b4-67.dat	themida
behavioral1/memory/1804-69-0x000000013F410000-0x000000013F411000-memory.dmp	themida
behavioral1/files/0x00040000000130b4-78.dat	themida
behavioral1/memory/1096-80-0x000000013F790000-0x000000013F791000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 3 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	MicrosoftApi.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	MicrosoftApi.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	a4bd709d2da4d231ecbeca29fa852bdd.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 3 IoCs

pid	Process
1724	a4bd709d2da4d231ecbeca29fa852bdd.exe
1804	MicrosoftApi.exe
1096	MicrosoftApi.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1444	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1064	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1096	MicrosoftApi.exe
1096	MicrosoftApi.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe
1520	ScreanDriver.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1096	MicrosoftApi.exe
Token: SeDebugPrivilege	1520	ScreanDriver.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1724 wrote to memory of 1804	1724	a4bd709d2da4d231ecbeca29fa852bdd.exe	30
PID 1724 wrote to memory of 1804	1724	a4bd709d2da4d231ecbeca29fa852bdd.exe	30
PID 1724 wrote to memory of 1804	1724	a4bd709d2da4d231ecbeca29fa852bdd.exe	30
PID 1804 wrote to memory of 820	1804	MicrosoftApi.exe	31
PID 1804 wrote to memory of 820	1804	MicrosoftApi.exe	31
PID 1804 wrote to memory of 820	1804	MicrosoftApi.exe	31
PID 820 wrote to memory of 1064	820	cmd.exe	33
PID 820 wrote to memory of 1064	820	cmd.exe	33
PID 820 wrote to memory of 1064	820	cmd.exe	33
PID 820 wrote to memory of 1444	820	cmd.exe	34
PID 820 wrote to memory of 1444	820	cmd.exe	34
PID 820 wrote to memory of 1444	820	cmd.exe	34
PID 1472 wrote to memory of 1096	1472	taskeng.exe	36
PID 1472 wrote to memory of 1096	1472	taskeng.exe	36
PID 1472 wrote to memory of 1096	1472	taskeng.exe	36
PID 1096 wrote to memory of 1520	1096	MicrosoftApi.exe	37
PID 1096 wrote to memory of 1520	1096	MicrosoftApi.exe	37
PID 1096 wrote to memory of 1520	1096	MicrosoftApi.exe	37

C:\Users\Admin\AppData\Local\Temp\a4bd709d2da4d231ecbeca29fa852bdd.exe
"C:\Users\Admin\AppData\Local\Temp\a4bd709d2da4d231ecbeca29fa852bdd.exe"
1⤵
- Checks BIOS information in registry
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:1724
- C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe
  "C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:1804
- - C:\Windows\system32\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpACC3.tmp.cmd""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:820
  - - C:\Windows\system32\timeout.exe
      timeout 4
      4⤵
      Delays execution with timeout.exe
      PID:1064
  - - C:\Windows\system32\schtasks.exe
      schtasks.exe /create /f /sc MINUTE /mo 1 /tn "MicrosoftApi" /tr "'C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe"'
      4⤵
      Creates scheduled task(s)
      PID:1444

C:\Windows\system32\taskeng.exe
taskeng.exe {027A6E86-CFC5-40CC-82E2-CD1CBEFCABB1} S-1-5-21-2455352368-1077083310-2879168483-1000:QWOCTUPM\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1472
- C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe
  C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Loads dropped DLL
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1096
- - C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\ScreanDriver.exe
    "C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\ScreanDriver.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1520

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1096-84-0x0000000002110000-0x0000000002112000-memory.dmp

Filesize
8KB

Download
memory/1096-80-0x000000013F790000-0x000000013F791000-memory.dmp

Filesize
4KB

Download
memory/1096-82-0x0000000000070000-0x0000000000071000-memory.dmp

Filesize
4KB

Download
memory/1096-83-0x000007FE80010000-0x000007FE80011000-memory.dmp

Filesize
4KB

Download
memory/1096-86-0x0000000002660000-0x0000000002661000-memory.dmp

Filesize
4KB

Download
memory/1520-94-0x000000001D566000-0x000000001D585000-memory.dmp

Filesize
124KB

Download
memory/1520-93-0x000000001D560000-0x000000001D562000-memory.dmp

Filesize
8KB

Download
memory/1520-91-0x000000013FA40000-0x000000013FA41000-memory.dmp

Filesize
4KB

Download
memory/1724-64-0x000007FE80010000-0x000007FE80011000-memory.dmp

Filesize
4KB

Download
memory/1724-61-0x000000013F960000-0x000000013F961000-memory.dmp

Filesize
4KB

Download
memory/1724-63-0x00000000001E0000-0x00000000001E1000-memory.dmp

Filesize
4KB

Download
memory/1804-70-0x0000000000070000-0x0000000000071000-memory.dmp

Filesize
4KB

Download
memory/1804-72-0x000007FE80010000-0x000007FE80011000-memory.dmp

Filesize
4KB

Download
memory/1804-69-0x000000013F410000-0x000000013F411000-memory.dmp

Filesize
4KB

Download