nymaim | 780335aab176ad9f34882413ef598cbd3502b918f6f68a0e6c3a51ee29f4df62

General

Target

file.exe
Size

2.1MB
MD5

cf3c2052420eb66843c7191d1113b4b8
SHA1

8b4f787fc26073f4e993bb54083dedec71a286f4
SHA256

780335aab176ad9f34882413ef598cbd3502b918f6f68a0e6c3a51ee29f4df62
SHA512

c60aaa7e19b90c3ac18051b6312715381aa301a9d1a72e7eaa9995b027974fa270a868f3de88fb4962ab3ab10fe6449091f1a29b01cbf91af2e30ab368de31df
SSDEEP

49152:+pnYgKJuBM4iTP/wNvmXlkgRSrWE9IGfziXkf/Pus6SgzxG:+lYgKJsM4ijwcViaUiXmu2

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

45.139.105.171

85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
4344	is-FFTRH.tmp
4744	SplitFiles116.exe
4916	g9HUOQ.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	SplitFiles116.exe

Loads dropped DLL 1 IoCs

pid	Process
4344	is-FFTRH.tmp

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

Drops file in Program Files directory 17 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Split Files\language\is-8P9L5.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-CU0LM.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-98VG0.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\is-H3SQ1.tmp	is-FFTRH.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles116.exe	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\is-SM78Q.tmp	is-FFTRH.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-PRQGS.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\is-LN6SB.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-VEHLU.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\is-VT69K.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-2VPGM.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-9M02U.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LQQQ6.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\is-JMBHH.tmp	is-FFTRH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-68KAG.tmp	is-FFTRH.tmp

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
4556	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4744	SplitFiles116.exe
4744	SplitFiles116.exe
4744	SplitFiles116.exe
4744	SplitFiles116.exe
4744	SplitFiles116.exe
4744	SplitFiles116.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4556	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2332 wrote to memory of 4344	2332	file.exe	81
PID 2332 wrote to memory of 4344	2332	file.exe	81
PID 2332 wrote to memory of 4344	2332	file.exe	81
PID 4344 wrote to memory of 4744	4344	is-FFTRH.tmp	82
PID 4344 wrote to memory of 4744	4344	is-FFTRH.tmp	82
PID 4344 wrote to memory of 4744	4344	is-FFTRH.tmp	82
PID 4744 wrote to memory of 4916	4744	SplitFiles116.exe	83
PID 4744 wrote to memory of 4916	4744	SplitFiles116.exe	83
PID 4744 wrote to memory of 4916	4744	SplitFiles116.exe	83
PID 4744 wrote to memory of 4580	4744	SplitFiles116.exe	85
PID 4744 wrote to memory of 4580	4744	SplitFiles116.exe	85
PID 4744 wrote to memory of 4580	4744	SplitFiles116.exe	85
PID 4580 wrote to memory of 4556	4580	cmd.exe	87
PID 4580 wrote to memory of 4556	4580	cmd.exe	87
PID 4580 wrote to memory of 4556	4580	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2332
- C:\Users\Admin\AppData\Local\Temp\is-0O4CT.tmp\is-FFTRH.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-0O4CT.tmp\is-FFTRH.tmp" /SL4 $8005A "C:\Users\Admin\AppData\Local\Temp\file.exe" 1955463 316928
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4344
- - C:\Program Files (x86)\Split Files\SplitFiles116.exe
    "C:\Program Files (x86)\Split Files\SplitFiles116.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4744
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\g9HUOQ.exe
      4⤵
      Executes dropped EXE
      PID:4916
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles116.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles116.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4580
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles116.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4556

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Program Files (x86)\Split Files\SplitFiles116.exe

Filesize
3.5MB

MD5
c490c040e001ec1793fdec7278511233

SHA1
58b0c5f7597216348cfab3b69f9019970c07c37e

SHA256
49f817233209f1135c7956293bc6f090edf01df5ae9106a528ed1d968b999362

SHA512
31c542f2f15cf74ecbc024e3dd6b899ec189e56da2695f4a5ff671a7b1a94143f6760a2741bcdd3a209a1945f6557401f6a076c995a3a51e489a9ae7b734978c

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles116.exe

Filesize
3.5MB

MD5
c490c040e001ec1793fdec7278511233

SHA1
58b0c5f7597216348cfab3b69f9019970c07c37e

SHA256
49f817233209f1135c7956293bc6f090edf01df5ae9106a528ed1d968b999362

SHA512
31c542f2f15cf74ecbc024e3dd6b899ec189e56da2695f4a5ff671a7b1a94143f6760a2741bcdd3a209a1945f6557401f6a076c995a3a51e489a9ae7b734978c

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-0O4CT.tmp\is-FFTRH.tmp

Filesize
903KB

MD5
a8d43e7a38a2009bd5d0527ceba02d5b

SHA1
ee273f102f2a186de3f354853ca822354ba0e52a

SHA256
7dc82ab3f67cfc883b0003562a67936b00870776d0a2c157425284772f3a64d4

SHA512
e65ec04be62811943faa59ce34d5659073865156f6cbcd6f017e3f97fd0dd306f83067324c4f58428e045009fcaeb65ae2ca019d22283030bf38c228abb7bc45

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-0O4CT.tmp\is-FFTRH.tmp

Filesize
903KB

MD5
a8d43e7a38a2009bd5d0527ceba02d5b

SHA1
ee273f102f2a186de3f354853ca822354ba0e52a

SHA256
7dc82ab3f67cfc883b0003562a67936b00870776d0a2c157425284772f3a64d4

SHA512
e65ec04be62811943faa59ce34d5659073865156f6cbcd6f017e3f97fd0dd306f83067324c4f58428e045009fcaeb65ae2ca019d22283030bf38c228abb7bc45

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-A3OVA.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\g9HUOQ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\g9HUOQ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/2332-155-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2332-138-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2332-132-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4744-143-0x0000000000400000-0x000000000157F000-memory.dmp

Filesize
17.5MB

Download
memory/4744-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4744-151-0x0000000000400000-0x000000000157F000-memory.dmp

Filesize
17.5MB

Download
memory/4744-142-0x0000000000400000-0x000000000157F000-memory.dmp

Filesize
17.5MB

Download
memory/4744-154-0x0000000000400000-0x000000000157F000-memory.dmp

Filesize
17.5MB

Download

Analysis

Sharing